The scale effect in composites: An explanation physically based on the different mechanisms of damage involved in failure

Paris F.; Velasco M. L.; Correa E.

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The scale effect in composites: An explanation physically based on the different mechanisms of damage involved in failure

机译：复合材料中的比例效应：基于对失败涉及的不同机制的解释

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The strength of a lamina of a laminate was considered from almost the very beginning of the application of composites as a value depending on the lamina thickness. This was generically called scale effect, the value of the stress at the appearance of first damage in a lamina being identified as the in situ strength. The ultra thin plies have allowed this first damage, typically transverse cracks in the 90-degree laminas, to be delayed.This study presents a completely physically based explanation of the scale effect in composites based on the key identification of two different failure mechanisms in the 90-degree lamina of a [0,90(n)](S) laminate (here called progressive and explosive) that are triggered as a function of the morphology of the laminate. Their characterization is based on energy concepts and does not require either properties of difficult interpretations or fitting parameters.The study extends from plies of conventional thickness to ultra-thin plies. BEM models have been performed, correlating the predictions with experimental microscopic observations. Developing a physically based explanation of the scale effect is the first step towards identifying the parameters involved in the failure initiation. Once identified, these parameters can be measured.

机译：从复合材料施加的几乎是根据薄层厚度的值，几乎是从复合材料的几乎开始的几乎开始的薄层的强度。这是经过的称为比例效应，在薄片中的第一次损坏的应力的值被识别为原位强度。超薄层已经允许该第一损坏，通常在90度LAMINAS中的横裂脉冲延迟。本研究基于两种不同故障机制的关键识别，对复合材料中的尺度效应完全基于基于物理基于物理学的解释。 90度薄膜的A [0,90（n）]（S）层压板（此处称为渐进和爆炸），其作为层压板形态的函数被引发。它们的表征基于能量概念，并且不需要难以解释或拟合参数的任何特性。该研究从常规厚度的层延伸到超薄层。已经进行了BEM模型，将预测与实验微观观察相关联。开发基于物理上的尺度效果的解释是朝着识别失败启动中涉及的参数的第一步。一旦识别，可以测量这些参数。

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来源
《Composite Structures》 |2021年第2期|113089.1-113089.19|共19页
作者
Paris F.; Velasco M. L.; Correa E.;
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作者单位

Univ Seville Sch Engn Grp Elastic & Strength Mat Seville Spain;

Univ Seville Sch Engn Grp Elastic & Strength Mat Seville Spain;

Univ Seville Sch Engn Grp Elastic & Strength Mat Seville Spain;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Composites; Scale effect; In situ strength; Ultra-thin plies;

机译：复合材料;规模效果;原位强度;超薄层;

The scale effect in composites: An explanation physically based on the different mechanisms of damage involved in failure

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