Sequential damage study induced in fiber reinforced composites by shear and tensile stress using a newly developed Arcan fixture

Din, Israr Ud; Tu, Shanshan; Hao, P.; Panier, S.; Khan, Kamran A.; Umer, Rehan; Shah, S.Z.H.; Franz, Gérald; Aamir, Muhammad

doi:10.1016/j.jmrt.2020.09.067

Cited by 27 publications

(12 citation statements)

References 39 publications

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“…Learning stress is the psychological burden and strain induced by highly stimulating the brain and is associated with learning pressure [1]. When students are under moderate learning pressure, they can improve their cognitive abilities and mobilize their initiative and enthusiasm for learning.…”

Section: Introductionmentioning

confidence: 99%

Algorithm for Evaluating the Intervention Effect of Physical Exercise on Stress Groups

Yang

Ding

2022

Mobile Information Systems

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Mental health is always a concern, especially for students, as they are more prone to stress based on educational burden and competition. Among student groups at different levels, college students are of serious concern as they are an essential pillar of social and economic development, and their mental health has been the society’s focus in recent years. With the increasing population leading to the increasing number of college students in our country, the competition for professional learning is also becoming fiercer, seriously affecting students’ mental health. Little attention has been paid to adverse effects on mental health or effective mitigation strategies to improve mental health in recent years. However, it is still of grave concern as the stress among students leads to depression, several diseases, and ultimately death. The purpose of this study is to evaluate the effect of physical exercise interventions on stress groups irrespective of their (educational) levels. Physical activity can effectively release stress and is an excellent way to regulate emotions. For this reason, it is a task that the current universities must complete to strengthen physical exercise in students’ mental health education. The paper highlights the impact of various social pressures on students’ mental health, understands its underlying mechanisms, and explores feasible mitigation strategies for improving and schooling students’ mental health. This paper proposes an integrated evaluation-based algorithm to explore the model of the intervention effect of physical exercise on college students. It takes college students as the representative of stress groups. The results show that daily physical activities can effectively relieve the stress of college students.

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Section: Introductionmentioning

confidence: 99%

Algorithm for Evaluating the Intervention Effect of Physical Exercise on Stress Groups

Yang

Ding

2022

Mobile Information Systems

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“…For the intra-ply damage study, a ply-by-ply failure method was adopted where each glass ply was treated as a homogenized material with anisotropic elastic constants. In the case of UD ply, this scale is termed the meso-scale of the damage modeling [ 31 , 32 ]. Such damage modeling possesses a clear advantage over the homogenized laminate models, i.e., macro-models.…”

Section: Finite Element Modeling Of the Drilling Processmentioning

confidence: 99%

Three-Dimensional Finite Element Modeling of Drilling-Induced Damage in S2/FM94 Glass-Fiber-Reinforced Polymers (GFRPs)

et al. 2022

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Considering that the machining of composites particularly fiber-reinforced polymer composites (FRPCs) has remained a challenge associated with their heterogeneity and anisotropic nature, damage caused by drilling operations can be considerably mitigated by following optimum cutting parameters. In this work, we numerically evaluated the effects of cutting parameters, such as feed rate and spindle speed, on the thrust force and torque during the drilling of glass-fiber-reinforced polymers (GFRPs). A meso-scale, also known as unidirectional ply-level-based finite element modeling, was employed assuming an individual homogenized lamina with transversely isotropic material principal directions. To initiate the meso-scale damage in each lamina, 3D formulations of Hashin’s failure theory were used for fiber damage and Puck’s failure theory was implemented for matrix damage onset via user subroutine VUMAT in ABAQUS. The developed model accounted for the complex kinematics taking place at the drill–workpiece interface and accurately predicted the thrust force and torque profiles as compared with the experimental results. The thrust forces for various drilling parameters were predicted with a maximum of 10% error as compared with the experimental results. It was found that a combination of lower feed rates and higher spindle speeds reduced the thrust force, which in turn minimized the drilling-induced damage, thus providing useful guidelines for drilling operations with higher-quality products. Finally, the effect of coefficient of friction was also investigated. Accordingly, a higher coefficient of friction between the workpiece and drill-bit reduced the thrust force.

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“…The use of 3D-FRC has increased in recent years thanks to their superior transverse properties (impact resistance) and damage tolerance in comparison with 2D-FRC [ 1 , 2 , 3 , 4 , 5 ]. However, their in-plane properties were reduced, which was attributed to the waviness caused by the z-binder [ 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Off-Axis and On-Axis Performance of Novel Acrylic Thermoplastic (Elium®) 3D Fibre-Reinforced Composites under Flexure Load

et al. 2022

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The flexure response of novel thermoplastic (Elium®) 3D fibre-reinforced composites (FRC) was evaluated and compared with a conventional thermoset (Epolam®)-based 3D-FRC. Ten different types of sample 3D-FRC were prepared by varying fibre orientations, i.e., 0°, 30°, 45°, 60° and 90°, and resin system, i.e., thermoplastic and thermoset. The bending characteristics and failure mechanisms were determined by conducting a three-point bend test. Results elucidate that the on-axis specimens show linear response and brittle failure; in contrast, the off-axis specimens depicted highly nonlinear response and ductile failure. The thermoplastic on-axis specimen exhibited almost similar flexure strength; in comparison, the off-axis specimens show ~17% lower flexure strength compared to thermoset 3D-FRC. Thermoplastic 3D-FRC shows ~40% higher energy absorption, ~23% lower flexure modulus and ~27% higher flexure strains as compared to its thermoset counterpart.

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Sequential damage study induced in fiber reinforced composites by shear and tensile stress using a newly developed Arcan fixture

Cited by 27 publications

References 39 publications

Algorithm for Evaluating the Intervention Effect of Physical Exercise on Stress Groups

Algorithm for Evaluating the Intervention Effect of Physical Exercise on Stress Groups

Three-Dimensional Finite Element Modeling of Drilling-Induced Damage in S2/FM94 Glass-Fiber-Reinforced Polymers (GFRPs)

Off-Axis and On-Axis Performance of Novel Acrylic Thermoplastic (Elium®) 3D Fibre-Reinforced Composites under Flexure Load

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