The Experts below are selected from a list of 52851 Experts worldwide ranked by ideXlab platform
Eok-soo Kim - One of the best experts on this subject based on the ideXlab platform.
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Mechanical Analysis of Ceramic/Polymer Composite with Mesh-Type Lightweight Design Using Binder-Jet 3D Printing.
Materials, 2018Co-Authors: Dong-hyun Kim, Jinju Bae, Sung-bum Park, Jihwan Choi, Jeong Hun Lee, Jinwoo Lee, Eok-soo KimAbstract:3D printing technology has recently been highlighted as an innovative manufacturing process. Among various 3D printing methods, binder jetting (BJ) 3D printing is particularly known as technology used to produce the complex sand mold quickly for a casting process. However, high manufacturing costs, due to its expensive materials, need to be lowered for more industrial applications of 3D printing. In this study, we investigated mechanical properties of sand molds with a Lightweight structure for low material consumption and short process time. Our stress analysis using a computational approach, revealed a structural weak point in the mesh-type Lightweight Design applied to the 3D-printed ceramic/polymer composite.
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mechanical analysis of ceramic polymer composite with mesh type Lightweight Design using binder jet 3d printing
Materials, 2018Co-Authors: Donghyu Kim, Sung-bum Park, Jihwa Choi, Jeong Hu Lee, Jinwoo Lee, Eok-soo KimAbstract:3D printing technology has recently been highlighted as an innovative manufacturing process. Among various 3D printing methods, binder jetting (BJ) 3D printing is particularly known as technology used to produce the complex sand mold quickly for a casting process. However, high manufacturing costs, due to its expensive materials, need to be lowered for more industrial applications of 3D printing. In this study, we investigated mechanical properties of sand molds with a Lightweight structure for low material consumption and short process time. Our stress analysis using a computational approach, revealed a structural weak point in the mesh-type Lightweight Design applied to the 3D-printed ceramic/polymer composite.
Ping Zhu - One of the best experts on this subject based on the ideXlab platform.
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an improved multi objective optimization algorithm with mixed variables for automobile engine hood Lightweight Design
Journal of Mechanical Science and Technology, 2021Co-Authors: Zhao Liu, Ping ZhuAbstract:Engine hood is one of the important parts of the vehicles, which has influences on the Lightweight, structural safety, pedestrian protection, and aesthetics. The optimization Design of engine hood is a high-dimensional, multi-objective, and mixed-variable optimization problem. In order to reduce the physical test investment in the development and improve the efficiency of optimization, this article proposes a data-driven method for optimal hood Design. A newly proposed single-objective optimization algorithm is improved by several strategies for multi-objective constrained problem with mixed variables. Then the hood is optimized through the specially Designed machine learning model. Finally, both the hood's weight and pedestrian injury are reduced while maintaining structural stiffness and frequency in the desired range. The comparative study and final hood optimization results prove the effectiveness of the proposed method.
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a modified particle swarm optimisation algorithm and its application in vehicle Lightweight Design
International Journal of Vehicle Design, 2017Co-Authors: Zhao Liu, Ping Zhu, Wei Chen, Chao Zhu, Renjye YangAbstract:Particle swarm optimisation (PSO) is a global optimisation algorithm, which imitates the cooperation behaviour reflected in flocks of birds, fishes, etc. Because of its simple implementation and strong optimisation capacity, the PSO algorithm is becoming very popular in diverse engineering Design applications. However, PSO is also seriously affected by the premature convergence problem similar to other global optimisation algorithms. It is generally known that diversity loss is one of the crucial impact factors. To improve the diversity of particles and enhance the algorithm's optimisation ability, the standard PSO algorithm is improved by a mutation operator, the optimal Latin hypercube Design (OLHD) technique and boundary reflection method. Optimisation ability of the modified PSO is superior to the standard version through experimental comparison of eight benchmark functions. Combined with kriging surrogate model technique, the modified PSO algorithm is applied to a vehicle Lightweight Design problem. The frontal structure achieves 5.06 kg (13.95%) weight saving without performances loss after being optimised.
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Lightweight Design of automotive composite bumper system using modified particle swarm optimizer
Composite Structures, 2016Co-Authors: Zhao Liu, Ping ZhuAbstract:Abstract Considering the crashworthiness and Lightweight requirements in automotive industry, composite materials have been gaining increasingly more attention for their high specific strength, high specific stiffness and high energy absorption capability. Bumper system is one of the main structures which protect cars from the front and rear collisions. It is an effective way to develop the bumper system using composite materials to meet the crash safety and Lightweight demands simultaneously. However, the application of composite material also introduces great challenges into the optimization Design process, such as complex non-linear material behavior, multi-working conditions and large amount of Design variables. In this paper, a structure Design and optimization method is proposed for a commercial front bumper system made by carbon fiber woven composite. An integrated bumper system structure is presented considering the manufacturing process of composite material. Then, an optimization procedure incorporating the Kriging modeling technique and a modified PSO algorithm is proposed to find the optimal combination of Design variables. The real vehicle experiment proves that the optimized bumper system meets all the requirements on strength and crashworthiness while with 31.5% weight reduction. The results reveal that the proposed Design method is an efficient and effective way for composite structure Design.
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robust expected violation criterion for constrained robust Design problems and its application in automotive Lightweight Design
Journal of Shanghai Jiaotong University (science), 2013Co-Authors: Si Liang Zhang, Ping Zhu, Wei ChenAbstract:Metamodeling techniques are commonly used to replace expensive computer simulations in robust Design problems. Due to the discrepancy between the simulation model and metamodel, a robust solution in the infeasible region can be found according to the prediction error in constraint responses. In deterministic optimizations, balancing the predicted constraint and metamodeling uncertainty, expected violation (EV) criterion can be used to explore the Design space and add samples to adaptively improve the fitting accuracy of the constraint boundary. However in robust Design problems, the predicted error of a robust Design constraint cannot be represented by the metamodel prediction uncertainty directly. The conventional EV-based sequential sampling method cannot be used in robust Design problems. In this paper, by investigating the effect of metamodeling uncertainty on the robust Design responses, an extended robust expected violation (REV) function is proposed to improve the prediction accuracy of the robust Design constraints. To validate the benefits of the proposed method, a crashworthiness-based Lightweight Design example, i.e. a highly nonlinear constrained robust Design problem, is given. Results show that the proposed method can mitigate the prediction error in robust constraints and ensure the feasibility of the robust solution.
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fatigue properties of transformation induced plasticity and dual phase steels for auto body Lightweight experiment modeling and application
Materials & Design, 2010Co-Authors: Ping Zhu, Jin MengAbstract:The substitution of conventional high strength steels (HSS) with advanced high strength steels (AHSS), e.g., low-alloy multiphase transformation-induced plasticity steel (TRIP steel) or dual-phase steel (DP steel), for body Lightweight brings about increased stress of notched components. Thus the fatigue properties of TRIP and DP steels and the fatigue life of notched Lightweight Design are important considerations for reasonable material selection during the Design stage of auto-body. For the mentioned issue, cyclic strain-controlled fatigue properties of TRIP and DP steels with equivalent grade and Lightweight result were investigated experimentally. Different cyclic behaviors of TRIP and DP steels were observed due to different interior microstructures. The cyclic stress behavior of TRIP steel is characterized by cyclic hardening followed by stable at lower strain amplitudes, and softening at higher strain amplitudes; however cyclic softening followed by stable occurs consistently for DP steel throughout entire strain amplitude range of test. TRIP steel possesses enhanced fatigue life and cyclic stress at the same strain amplitude than DP steel. Furthermore, local strain-life models of two steels were developed by linear regression of experimental data, to predict and compare the fatigue life of notched body structures made of them by finite element method. The simulation result illustrates that TRIP steel can provide more beneficial potential than DP steel for the Lightweight Design of notched body structures from the viewpoint of fatigue resistance.
Jinwoo Lee - One of the best experts on this subject based on the ideXlab platform.
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Mechanical Analysis of Ceramic/Polymer Composite with Mesh-Type Lightweight Design Using Binder-Jet 3D Printing.
Materials, 2018Co-Authors: Dong-hyun Kim, Jinju Bae, Sung-bum Park, Jihwan Choi, Jeong Hun Lee, Jinwoo Lee, Eok-soo KimAbstract:3D printing technology has recently been highlighted as an innovative manufacturing process. Among various 3D printing methods, binder jetting (BJ) 3D printing is particularly known as technology used to produce the complex sand mold quickly for a casting process. However, high manufacturing costs, due to its expensive materials, need to be lowered for more industrial applications of 3D printing. In this study, we investigated mechanical properties of sand molds with a Lightweight structure for low material consumption and short process time. Our stress analysis using a computational approach, revealed a structural weak point in the mesh-type Lightweight Design applied to the 3D-printed ceramic/polymer composite.
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mechanical analysis of ceramic polymer composite with mesh type Lightweight Design using binder jet 3d printing
Materials, 2018Co-Authors: Donghyu Kim, Sung-bum Park, Jihwa Choi, Jeong Hu Lee, Jinwoo Lee, Eok-soo KimAbstract:3D printing technology has recently been highlighted as an innovative manufacturing process. Among various 3D printing methods, binder jetting (BJ) 3D printing is particularly known as technology used to produce the complex sand mold quickly for a casting process. However, high manufacturing costs, due to its expensive materials, need to be lowered for more industrial applications of 3D printing. In this study, we investigated mechanical properties of sand molds with a Lightweight structure for low material consumption and short process time. Our stress analysis using a computational approach, revealed a structural weak point in the mesh-type Lightweight Design applied to the 3D-printed ceramic/polymer composite.
Sung-bum Park - One of the best experts on this subject based on the ideXlab platform.
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Mechanical Analysis of Ceramic/Polymer Composite with Mesh-Type Lightweight Design Using Binder-Jet 3D Printing.
Materials, 2018Co-Authors: Dong-hyun Kim, Jinju Bae, Sung-bum Park, Jihwan Choi, Jeong Hun Lee, Jinwoo Lee, Eok-soo KimAbstract:3D printing technology has recently been highlighted as an innovative manufacturing process. Among various 3D printing methods, binder jetting (BJ) 3D printing is particularly known as technology used to produce the complex sand mold quickly for a casting process. However, high manufacturing costs, due to its expensive materials, need to be lowered for more industrial applications of 3D printing. In this study, we investigated mechanical properties of sand molds with a Lightweight structure for low material consumption and short process time. Our stress analysis using a computational approach, revealed a structural weak point in the mesh-type Lightweight Design applied to the 3D-printed ceramic/polymer composite.
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mechanical analysis of ceramic polymer composite with mesh type Lightweight Design using binder jet 3d printing
Materials, 2018Co-Authors: Donghyu Kim, Sung-bum Park, Jihwa Choi, Jeong Hu Lee, Jinwoo Lee, Eok-soo KimAbstract:3D printing technology has recently been highlighted as an innovative manufacturing process. Among various 3D printing methods, binder jetting (BJ) 3D printing is particularly known as technology used to produce the complex sand mold quickly for a casting process. However, high manufacturing costs, due to its expensive materials, need to be lowered for more industrial applications of 3D printing. In this study, we investigated mechanical properties of sand molds with a Lightweight structure for low material consumption and short process time. Our stress analysis using a computational approach, revealed a structural weak point in the mesh-type Lightweight Design applied to the 3D-printed ceramic/polymer composite.
Volker Uhlenwinkel - One of the best experts on this subject based on the ideXlab platform.
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additive manufacturing of high modulus steels new possibilities for Lightweight Design
Additive manufacturing, 2020Co-Authors: Hauke Springer, Christian Baron, F Mostaghimi, J Poveleit, Lutz Madler, Volker UhlenwinkelAbstract:Abstract This work demonstrates the feasibility of fabricating bulk nanostructured high modulus steels in-situ by additive manufacturing. This ideal match of novel processes and alloy concepts opens up new pathways for Lightweight Design by producing light, stiff, strong and ductile components with minimal geometric restraints. On the example of an Fe – Ti – B alloy, a conventional processing sequence of melting and casting pre-alloys, gas-atomisation and laser powder bed fusion (selective laser melting) led to finely dispersed metastable particle and matrix phases. A simple annealing step transformed them into the desired equilibrium constituents of ductile ferrite (matrix) and light and stiff TiB2 (particles), with only minimal changes in particle size (about 20–150 nm in diameter) and distribution (mainly on the matrix grain boundaries). This nano-scaled composite structure promises an extremely attractive property profile, i.e. an increased stiffness/ratio at elevated strength and without deteriorated ductility. However, the not yet optimized parameters of the laser fusion process led to the formation of few pores and cracks, which prevented the complete assessment of the property profile of the manufactured samples. Material and processing strategies for the further development of this promising Lightweight Design approach – including the suitability of other powder metallurgy processing routes – are outlined and discussed.