The Experts below are selected from a list of 58353 Experts worldwide ranked by ideXlab platform
Sarat Singamneni - One of the best experts on this subject based on the ideXlab platform.
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curved Layer adaptive slicing clas for fused deposition modelling
Rapid Prototyping Journal, 2015Co-Authors: Bin Huang, Sarat SingamneniAbstract:Purpose – This paper aims to develop a new slicing method for fused deposition modelling (FDM), the curved Layer adaptive slicing (CLAS), combining adaptive Flat Layer and curved Layer slicing together. Design/methodology/approach – This research begins with a review of current curved Layer and adaptive slicing algorithms employed in the FDM and further improvement of the same, where possible. The two approaches are then integrated to develop the adaptive curved Layer slicing based on the three-plane intersection method for curved Layer offsetting and consideration of facet angles together with the residual heights for adaptive slicing. A practical implementation showed that curved Layer adaptive Layers respond in similar lines to the Flat Layer counterparts in terms of the mechanical behaviour of FDM parts. Findings – CLAS is effective in capturing sharply varying surface profiles and other finer part details, apart from imparting fibre continuity. Three-point bending tests on light curved parts made of ...
Debi Kilb - One of the best experts on this subject based on the ideXlab platform.
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a strong correlation between induced peak dynamic coulomb stress change from the 1992 m7 3 landers california earthquake and the hypocenter of the 1999 m7 1 hector mine california earthquake
Journal of Geophysical Research, 2003Co-Authors: Debi KilbAbstract:The 1992 M7.3 Landers earthquake may have played a role in triggering the 1999 M7.1 1 Hector Mine earthquake as suggested by their close spatial (∼20 km) proximity. Current investigations of triggering by static stress changes produce differing conclusions when small variations in parameter values are employed. Here I test the hypothesis that large-amplitude dynamic stress changes, induced by the Landers rupture, acted to promote the Hector Mine earthquake. I use a Flat Layer reflectivity method to model the Landers earthquake displacement seismograms. By requiring agreement between the model seismograms and data, I can constrain the Landers main shock parameters and velocity model. A similar reflectivity method is used to compute the evolution of stress changes. I find a strong positive correlation between the Hector Mine hypocenter and regions of large (>4 MPa) dynamic Coulomb stress changes (peak Δσ f (t)) induced by the Landers main shock. A positive correlation is also found with large dynamic normal and shear stress changes. Uncertainties in peak Δσ f (t) (1.3 MPa) are only 28% of the median value (4.6 MPa) determined from an extensive set (160) of model parameters. Therefore the correlation with dynamic stresses is robust to a range of Hector Mine main shock parameters, as well as to variations in the friction and Skempton's coefficients used in the calculations. These results imply dynamic stress changes may be an important part of earthquake trigging, such that large-amplitude stress changes alter the properties of an existing fault in a way that promotes fault failure.
Bin Huang - One of the best experts on this subject based on the ideXlab platform.
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curved Layer adaptive slicing clas for fused deposition modelling
Rapid Prototyping Journal, 2015Co-Authors: Bin Huang, Sarat SingamneniAbstract:Purpose – This paper aims to develop a new slicing method for fused deposition modelling (FDM), the curved Layer adaptive slicing (CLAS), combining adaptive Flat Layer and curved Layer slicing together. Design/methodology/approach – This research begins with a review of current curved Layer and adaptive slicing algorithms employed in the FDM and further improvement of the same, where possible. The two approaches are then integrated to develop the adaptive curved Layer slicing based on the three-plane intersection method for curved Layer offsetting and consideration of facet angles together with the residual heights for adaptive slicing. A practical implementation showed that curved Layer adaptive Layers respond in similar lines to the Flat Layer counterparts in terms of the mechanical behaviour of FDM parts. Findings – CLAS is effective in capturing sharply varying surface profiles and other finer part details, apart from imparting fibre continuity. Three-point bending tests on light curved parts made of ...
Stan Rodrigues - One of the best experts on this subject based on the ideXlab platform.
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Development of a curved Layer LOM process for monolithic ceramics and ceramic matrix composites
Rapid Prototyping Journal, 1999Co-Authors: Donald A. Klosterman, Gyoowan Han, George Graves, Nora Osborne, Allan Lightman, Ákos Bezerédi, Richard P. Chartoff, Stan RodriguesAbstract:A novel rapid prototyping technology incorporating a curved Layer building style was developed. The new process, based on laminated object manufacturing (LOM), was designed for efficient fabrication of curved Layer structures made from ceramics and fiber reinforced composites. A new LOM machine was created, referred to as curved Layer LOM. This new machine uses ceramic tapes and fiber prepregs as feedstocks and fabricates curved structures on a curved-Layer by curved-Layer basis. The output of the process is a three-dimensional “green” ceramic that is capable of being processed to a seamless, fully dense ceramic using traditional techniques. A detailed description is made of the necessary software and hardware for this new process. Also reviewed is the development of ceramic preforms and accompanying process technology for net shape ceramic fabrication. Monolithic ceramic (SiC) and ceramic matrix composite (SiC/SiC) articles were fabricated using both the Flat Layer and curved Layer LOM processes. For making curved Layer objects, the curved process afforded the advantages of eliminated stair step effect, increased build speed, reduced waste, reduced need for decubing, and maintenance of continuous fibers in the direction of curvature.
Kai Tang - One of the best experts on this subject based on the ideXlab platform.
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variable depth curved Layer fused deposition modeling of thin shells
Robotics and Computer-integrated Manufacturing, 2019Co-Authors: Lufeng Chen, Man Fai Chung, Yaobin Tian, Ajay Joneja, Kai TangAbstract:Abstract This paper presents a framework containing thin-shell modeling, curved Layer slicing, and process planning algorithms for a variable-depth curved Layer multi-axis additive manufacturing process for printing thin-shells. Currently, to print a thin-shell part such as a blade, under the popular paradigm of fused deposition modeling (FDM), the traditional type of Flat Layer three-axis printing suffers from the severe stair-step effect on the printed surface. Even with a more advanced multi-axis 3D printer that enables curved Layer FDM (CLFDM), at present, only uniform-thickness Layers are supported, which again is unable to resolve the pronounced stair-step problem. However, by allowing the sliced Layers to have variable thicknesses and adjusting the build direction adaptively with respect to the surface normal, the stair-step effect can be either completely eradicated or reduced to the minimum. While the presented framework is targeted specifically at the algorithmic aspect of this ideal five-axis CLFDM printing, we have also performed physical experiments on a prototype five-axis FDM printer. The experimental results have validated the feasibility of our proposed methodology and demonstrated its potential in many applications.