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Buckling analyses of viscoelastic structures considering ageing and damage effects

机译：考虑老化和损伤效应的粘弹性结构的屈曲分析

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摘要

The durability of structures made of composite materials is affected by diverse factors, among which creep deformation, ageing and damage. Ageing is related to elapsed time (with different effects in different environmental conditions); damage is related to microstructural modifications due stress and/or strain inputs.The formal definition of these effects and the corresponding constitutive formulations are presented. These formulations are used to obtain analytical solutions and also to implement a Finite Element programme for viscoelastic analysis of laminar structures in a large displacement with small strains context. Then, the effects of ageing and damage on both the short and the long term stability of beam columns are analyzed. Some examples for verification of the formulation and for the comparison of effect are presented.
机译：复合材料制成的结构的耐久性受多种因素影响，其中包括蠕变，老化和损坏。老化与经过时间有关（在不同的环境条件下具有不同的影响）；损伤与应力和/或应变输入引起的微观结构改变有关。给出了这些作用的正式定义以及相应的本构公式。这些公式用于获得分析解决方案，还用于实施有限元程序，用于在小应变情况下大位移的层状结构的粘弹性分析。然后，分析了老化和损伤对梁柱短期和长期稳定性的影响。给出了一些用于验证配方和比较效果的例子。

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