The Experts below are selected from a list of 4908 Experts worldwide ranked by ideXlab platform
Junjiang Xiong - One of the best experts on this subject based on the ideXlab platform.
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Progressive damage modelling and fatigue life prediction of Plain-weave composite laminates with Low-velocity impact damage
Composite Structures, 2026Co-Authors: Zheng-qiang Cheng, Wei Tan, Junjiang XiongAbstract:Abstract This paper developed a fatigue-driven residual strength model considering the Effects of low-velocity impact (LVI) damage and stress ratio. New fatigue failure criteria based on fatigue-driven residual strength concept and fatigue progressive damage model were developed to simulate fatigue damage growth and predict fatigue life for plain-weave composite laminates with LVI damage. To validate the proposed model, LVI tests of plain-weave glass fibre reinforced polymer 3238A/EW250F laminates were conducted, followed by post-impact constant amplitude tension–tension, compression-compression fatigue tests and multi-step fatigue tests. Experimental results indicate that the LVI damage degrades fatigue strength of plain-weave glass fibre composite laminate drastically. The Load history also plays an important role on the fatigue accumulation damage of post-impact laminates. The new fatigue progressive damage model achieves a good agreement with fatigue life of post-impact laminates and is able to capture the Load Sequence Effect , opening a new avenue to predict fatigue failure of composite laminates.
Abedulgader Baktheer - One of the best experts on this subject based on the ideXlab platform.
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fracture mechanics based interpretation of the Load Sequence Effect in the flexural fatigue behavior of concrete using digital image correlation
Construction and Building Materials, 2021Co-Authors: Abedulgader Baktheer, Henrik BecksAbstract:Abstract For a reliable and economical design of concrete structures subjected to fatigue Loading, a comprehensive understanding and realistic prediction of concrete fatigue life under complex Loading scenarios with variable amplitudes is of major concern. In this paper, experimental investigations of concrete behavior under monotonic, cyclic, and fatigue Loading are presented with particular focus on the influence of Loading Sequence on fatigue life. Namely, a test campaign consisting of 32 three-point bending tests on notched beams was conducted, including two beam sizes and six different Loading scenarios. Several response characteristics of the fatigue behavior including, fatigue creep curves, Wohler curves, stiffness degradation, evolving shapes of hysteretic loops, and crack propagation aspects have been evaluated. In addition, the main dissipative mechanisms governing the flexural behavior of concrete under repeated Loading were analyzed based on a wide range of Loading scenarios. Furthermore, the Effect of Loading Sequence has been studied and analyzed in detail with the help of a 3D digital image correlation (DIC) system. Based on these observations, a theoretical interpretation of the phenomenology behind the Sequence Effect under bending Loading is provided considering the fatigue crack propagation aspects and the corresponding stress redistribution around the crack tip.
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experimental and theoretical evidence for the Load Sequence Effect in the compressive fatigue behavior of concrete
Materials and Structures, 2021Co-Authors: Abedulgader Baktheer, Rostislav ChudobaAbstract:A realistic prediction of the concrete fatigue life exposed to high-cycle Loading scenarios with variable amplitudes is of utmost importance for a reliable and economically efficient design of civil engineering infrastructure for transport and energy supply. Current design codes estimate the fatigue life under variable amplitudes using the Palmgren–Miner rule, which assumes a linear scaling between lifetimes measured for uniform cyclic Loading scenarios. Several experimental series conducted in the past, however, indicate that this assumption is not valid and that it may lead to unsafe design. In this paper, an experimental and theoretical investigations of the fatigue Loading Sequence Effect in normal- and high-strength concrete behavior are presented, which confirm this observation. In particular, a test campaign with 135 cylinder specimens, including three concrete grades and six different Loading scenarios has been conducted. Several response characteristics of the fatigue behavior including Wohler curves, fatigue creep curves and evolving shapes of hysteretic loops have been evaluated. To substantiate the experimental results, a theoretical explanation of the observed Sequence Effect is formulated based on the assumption, that energy is dissipated uniformly within the volume of a test specimen during subcritical, compressive cyclic Loading. Then, superposition of energy dissipation profiles along the lifetime measured for constant amplitudes becomes possible and a theoretical justification of the experimentally observed Sequence Effect can be provided. Moreover, a reverse Sequence Effect reported in the literature for bending fatigue of concrete can then be explained by an unevenly distributed energy dissipation over a cracked specimen. Supported by the theoretical consideration, the processed experimental data is used to validate existing fatigue life assessment rules by testing their ability to reflect the Load Sequence Effect.
Zheng-qiang Cheng - One of the best experts on this subject based on the ideXlab platform.
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Progressive damage modelling and fatigue life prediction of Plain-weave composite laminates with Low-velocity impact damage
Composite Structures, 2026Co-Authors: Zheng-qiang Cheng, Wei Tan, Junjiang XiongAbstract:Abstract This paper developed a fatigue-driven residual strength model considering the Effects of low-velocity impact (LVI) damage and stress ratio. New fatigue failure criteria based on fatigue-driven residual strength concept and fatigue progressive damage model were developed to simulate fatigue damage growth and predict fatigue life for plain-weave composite laminates with LVI damage. To validate the proposed model, LVI tests of plain-weave glass fibre reinforced polymer 3238A/EW250F laminates were conducted, followed by post-impact constant amplitude tension–tension, compression-compression fatigue tests and multi-step fatigue tests. Experimental results indicate that the LVI damage degrades fatigue strength of plain-weave glass fibre composite laminate drastically. The Load history also plays an important role on the fatigue accumulation damage of post-impact laminates. The new fatigue progressive damage model achieves a good agreement with fatigue life of post-impact laminates and is able to capture the Load Sequence Effect , opening a new avenue to predict fatigue failure of composite laminates.
Michael Muskulus - One of the best experts on this subject based on the ideXlab platform.
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Effect of Load Sequence and weather seasonality on fatigue crack growth for monopile based offshore wind turbines
Energy Procedia, 2016Co-Authors: Lisa Sabine Ziegler, Sebastian Schafhirt, Matti Niclas Scheu, Michael MuskulusAbstract:Abstract Offshore wind turbines are subjected to variable amplitude Loading, but the impact of Load Sequence is commonly neglected in fatigue analysis. This paper presents an initial investigation if Load Sequence and weather seasonality influence fatigue crack growth for monopile-based offshore wind turbines. Focus is on the Load Sequence Effect introduced by the non-linearity of crack propagation. Fatigue crack growth at two structural hot spots was analyzed with a fracture mechanics model applying Paris’ law. The model was calibrated to yield an identical lifetime as a SN-curve analysis. Input into the fracture mechanics model are structural stresses due to environmental and operational Loading. Weather seasonality was simulated with a Markov model. Results show that Loading Sequence has only a negligible Effect on crack sizes under the assumption made in this study. This makes fatigue lifetime predictions independent of weather seasonality. However, it becomes relevant for the prediction of future propagation of detected fatigue cracks throughout the year.
Henrik Becks - One of the best experts on this subject based on the ideXlab platform.
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fracture mechanics based interpretation of the Load Sequence Effect in the flexural fatigue behavior of concrete using digital image correlation
Construction and Building Materials, 2021Co-Authors: Abedulgader Baktheer, Henrik BecksAbstract:Abstract For a reliable and economical design of concrete structures subjected to fatigue Loading, a comprehensive understanding and realistic prediction of concrete fatigue life under complex Loading scenarios with variable amplitudes is of major concern. In this paper, experimental investigations of concrete behavior under monotonic, cyclic, and fatigue Loading are presented with particular focus on the influence of Loading Sequence on fatigue life. Namely, a test campaign consisting of 32 three-point bending tests on notched beams was conducted, including two beam sizes and six different Loading scenarios. Several response characteristics of the fatigue behavior including, fatigue creep curves, Wohler curves, stiffness degradation, evolving shapes of hysteretic loops, and crack propagation aspects have been evaluated. In addition, the main dissipative mechanisms governing the flexural behavior of concrete under repeated Loading were analyzed based on a wide range of Loading scenarios. Furthermore, the Effect of Loading Sequence has been studied and analyzed in detail with the help of a 3D digital image correlation (DIC) system. Based on these observations, a theoretical interpretation of the phenomenology behind the Sequence Effect under bending Loading is provided considering the fatigue crack propagation aspects and the corresponding stress redistribution around the crack tip.