Prediction method of breaking strength and toughness of brittle film

一种脆性薄膜断裂强度及韧性的预测方法

Abstract

The invention discloses a prediction method of breaking strength and toughness of a brittle film, comprising the following steps: A, using a four-points bending experiment to obtain a relation curve which shows that a film internal fissure density changes with a bending strain value; B, based on stress transmitting conditions of in the film structure under the effect of a four-points bending load, establishing a theory prediction model of the relationship between the film internal fissure density and the bending strain value; C, establishing a theory relation curve between the film internal fissure density and the bending strain value under different critical strain values; and D, selecting a theory relation curve in the step C, and determining that a critical strain value corresponding to the theory relation curve is a critical strain value that leads to the start of the film internal fissure, wherein, the selected theory relation curve in the step C is most consistent with the relation curve in the step A. According to the invention, a critical strain value of starting fissure of the brittle film under the effect of a four-points bending tension can be accurately predicted, simultaneously, the influence of residual stress of the film is considered in the calculation of the breaking strength and toughness of the film.
本发明公开了一种脆性薄膜断裂强度及韧性的预测方法,它包括以下步骤:A、采用四点弯曲实验,得到薄膜内部裂纹密度随弯曲应变值变化的关系曲线;B、基于四点弯曲载荷作用下薄膜结构内部的应力传递条件,建立薄膜内部裂纹密度与弯曲应变值关系的理论预测模型;C、建立在不同的临界应变值下的薄膜内部裂纹密度与弯曲应变值的理论关系曲线;D、选择步骤C中与步骤A中的关系曲线吻合程度最好的理论关系曲线,确定该理论关系曲线对应的临界应变值即为导致薄膜内部裂纹起始的临界应变值。本发明的方法可以精确预测脆性薄膜在四点弯曲拉应力作用下,发生裂纹的临界应变值,同时在薄膜的断裂强度和韧性的计算中,考虑了薄膜残余应力的影响。

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