Ratcheting behavior of crosslinked epoxy polymers was investigated by Maenghyo Cho and his team on page 1617, considering the effects of different molecular structures of curing agents (aromatic and aliphatic) by atomistic simulations. Various ratcheting strain evolutions, local stress accumulations, and stiffness variations were observed during the cyclic deformation depending on the type of curing agents. The article concludes irreversible dihedral angle transitions near the benzene ring of the curing agent were responsible for low ratcheting resistance and stiffness degradation. (DOI: 10.1002/pol.20200130)

中文翻译：

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封面图片，第58卷，第12期

Maenghyo Cho及其团队在第1617页上研究了交联环氧聚合物的棘轮行为，并通过原子模拟考虑了固化剂（芳香族和脂肪族）的不同分子结构的影响。根据固化剂的类型，在循环变形期间观察到各种棘轮应变演变，局部应力累积和刚度变化。该文章得出结论，固化剂苯环附近不可逆的二面角过渡是导致低棘轮阻力和刚度下降的原因。（DOI：10.1002 / pol.20200130）