Ⅰ-Ⅱ MIXED-MODE FRACTURE PROPERTY OF 2D-C/SIC COMPOSITES (MT)

LIN JiangRong; YANG ChengPeng; QI YunChao

doi:10.16579/j.issn.1001.9669.2023.03.010

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Ⅰ-Ⅱ MIXED-MODE FRACTURE PROPERTY OF 2D-C/SIC COMPOSITES (MT)

更新时间：2023-08-01

- Ⅰ-Ⅱ MIXED-MODE FRACTURE PROPERTY OF 2D-C/SIC COMPOSITES (MT)
- Journal of Mechanical Strength Issue 3, Pages: 576-583(2023)
- 作者机构：
  
  1. 西北工业大学力学与土木建筑学院
  2. 哈尔滨工业大学特种环境复合材料技术国家级重点实验室
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2023.03.010
  CLC：
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LIN JiangRong, YANG ChengPeng, QI YunChao. Ⅰ-Ⅱ MIXED-MODE FRACTURE PROPERTY OF 2D-C/SIC COMPOSITES (MT). [J]. Journal of Mechanical Strength (3):576-583(2023)
DOI：

LIN JiangRong, YANG ChengPeng, QI YunChao. Ⅰ-Ⅱ MIXED-MODE FRACTURE PROPERTY OF 2D-C/SIC COMPOSITES (MT). [J]. Journal of Mechanical Strength (3):576-583(2023) DOI： 10.16579/j.issn.1001.9669.2023.03.010.

摘要

为了表征2D-C/SiC复合材料的Ⅰ-Ⅱ复合型断裂性能，采用了含单边裂纹Arcan蝶形试样，通过有限元模型分别对试样的Ⅰ型和Ⅱ型断裂形状因子进行了标定。应用Arcan圆盘装置对2D-C/SiC蝶形试样开展了Ⅰ型、Ⅱ型和Ⅰ-Ⅱ复合型断裂试验，研究了试样在不同加载路径下的宏-细观断裂模式和强度性能。结果表明，2D-C/SiC复合材料Ⅱ型断裂韧度比Ⅰ型高；随着偏轴加载角度的增大，裂纹扩展路径受剪应力的影响变得显著，且试样的抗断性能有增强趋势。对几种断裂判据的适用性进行了论证，给出了2D-C/SiC复合材料的Ⅰ-Ⅱ复合型断裂表征模型。

Abstract

In order to characterize the Ⅰ-Ⅱ mixed-mode fracture performance of 2D-C/SiC composites, Arcan butterfly specimens with unilateral cracks were used, and the mode-Ⅰ and mode-Ⅱ fracture shape factors of the specimen were calibrated through finite element model. The Arcan disc device was used to carry out mode-Ⅰ, mode-Ⅱ and Ⅰ-Ⅱ mixed-mode fracture tests upon 2D-C/SiC butterfly specimens, and the macroscopic and microscopic fracture modes and strength properties of the specimens under different loading paths were investigated. The results show that the fracture toughness of mode-II of 2D-C/SiC material is higher than that of mode-I. With increasing of the loading angle, the influence of shear stress on the crack propagation path increases, and meanwhile the fracture resistance of the specimens presents a tendency to increase. The applicability of several fracture criteria is demonstrated, and an Ⅰ-Ⅱ mixed-mode fracture criterion for 2D-C/SiC composites is suggested.

关键词

陶瓷基复合材料复合型断裂有限元模型应力强度因子断裂准则

Keywords

Ceramic matrix compositesMixed-mode fractureFinite element modelStress intensity factorFracture criterion

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