Effect of the stress field on crack branching in brittle material

被引：11

作者：

Nakamura, Noritaka ^{[1
]}

Kawabata, Tomoya ^{[1
]}

Takashima, Yasuhito ^{[2
]}

Yanagimoto, Fuminori ^{[1
]}

机构：

[1] Univ Tokyo, Tokyo, Japan

[2] Osaka Univ, Suita, Osaka, Japan

来源：

THEORETICAL AND APPLIED FRACTURE MECHANICS | 2020年 / 108卷

基金：

日本学术振兴会;

关键词：

Brittle fracture; Roughness; Resin material; Macro-branch; T-stress; DYNAMIC FRACTURE; INTENSITY FACTOR; T-STRESS; INSTABILITY; PROPAGATION; ROUGHNESS; TOUGHNESS; MECHANISM; SURFACES;

D O I：

10.1016/j.tafmec.2020.102583

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

To research the effect of the stress field on brittle fracture surface roughness, two types of experiments with different stress fields around the crack tip, bending and tensile fracture tests, were performed with resin materials, PMMA and polycarbonate. Macro-crack branching in PMMA started when the crack speed was over 0.81 cr (cr: Rayleigh wave speed) in bending specimens and only 0.59 cr in tensile specimens. It was experimentally confirmed that the stress field affected fracture surface roughness, and it may be inappropriate to think that dissipated energy is dominated by crack speed only, as some conventional discussions suggest. We presumed that the promotion of macro-crack branching and the increase in fracture surface roughness were caused by a high T-stress. T-stress might act to open microbranches in the mist region because they are tilted to align with the ideally straight crack plane.

引用

页数：10

共 38 条

[1]

[Anonymous], 1948, Brittle fracture in mild steel plates

[2]

[Anonymous], 1921, Phil. Trans. Roy. Soc. A, DOI DOI 10.1098/RSTA.1921.0006

[3] RELATIONSHIPS BETWEEN FRACTURE PARAMETERS AND FRACTURE SURFACE-ROUGHNESS OF BRITTLE POLYMERS [J].