ASTM E2899-15
测量拉伸和弯曲状况下表面裂纹起裂韧度的标准试验方法
Standard Test Method for Measurement of Initiation Toughness in Surface Cracks Under Tension and Bending
ASTM E2899-15 发布历史
ASTM E2899-15由美国材料与试验协会 US-ASTM 发布于 2015。
ASTM E2899-15在国际标准分类中归属于: 19.040 环境试验。
ASTM E2899-15 发布之时，引用了标准
- ASTM C1421 环境温度下测定高级陶瓷断裂韧性的标准试验方法
- ASTM E1012 在拉伸负载下试样调直验证的标准实施规范
- ASTM E111 杨氏弹性模量、正切模量和弦切模量的标准试验方法
- ASTM E1820 断裂韧性测量的标准试验方法
- ASTM E1823 关于疲劳和断裂测试的标准术语
- ASTM E1921 测定碳素体钢在转变范围内基准温度的标准试验方法
- ASTM E399 金属材料平面应变断裂韧性的标准试验方法
- ASTM E4 试验机的负荷校准的标准实施规程
- ASTM E6 机械试验方法的有关标准术语
- ASTM E647 疲劳裂缝增长率测量的标准试验方法
- ASTM E740 用表面裂纹张力试样进行断裂试验的标准实践
- ASTM E8/E8M 金属材料拉伸试验的标准试验方法
ASTM E2899-15的历代版本如下：
- 2019年 ASTM E2899-19e1 在张力和弯曲下测量表面裂纹中起始韧度的标准测试方法
- 2019年 ASTM E2899-19 在张力和弯曲下测量表面裂纹中起始韧度的标准测试方法
- 2015年 ASTM E2899-15 测量拉伸和弯曲状况下表面裂纹起裂韧度的标准试验方法
- 2013年 ASTM E2899-13 测量拉伸和弯曲状况下表面裂纹起裂韧度的标准试验方法
5.1 Surface cracks are among the most common defects found in structural components. An accurate characterization and understanding of crack-front behavior is necessary to ensure successful operation of a structure containing surface cracks. The testing of laboratory specimens with surface cracks provides a means to understand and quantify surface crack behavior, but the test results must be interpreted correctly to ensure transferability between the laboratory specimen and the structure.
5.2 Transferability refers to the capacity of a fracture mechanics methodology to correlate the crack-tip stress and strain fields of different cracked bodies. Traditionally, the correlation has been based on the presence at fracture of a dominant, asymptotically singular, crack-tip field with amplitude set by the value of a single parameter, such as the stress intensity factor, KI, or the J-integral. For components and specimens with high crack-tip constraint, the singular crack-tip field dominates over microstructurally significant size scales for loads ranging from globally linear-elastic conditions to moderately large-scale plasticity. For specimens with low crack-tip constraint, a dominant single-parameter crack-tip field exists only at low levels of plasticity. At higher levels of plasticity, the opening mode stress of the low constraint specimen is lower than predicted by the single-parameter, asymptotically singular fields. Therefore, low constraint specimens often exhibit larger fracture toughness than do high constraint specimens. If feasible, users are strongly encouraged to generate high constraint fracture toughness data using methods such as Test Methods E399 or E1820 prior to testing the surface crack geometry.
5.2.1 To address this phenomenon, two-parameter fracture criteria are used to include the influence of crack-tip constraint. Crack-tip constraint has been quantified using various scalar parameters including the T-stress (6, 7, 8), Q (9, 10), stress triaxiality (11, 12), and αh (13, 14). Fracture toughness in a two-parameter methodology is not a single value, but rather is a curve that defines a critical locus of fracture toughness and constraint values (2). Fig. 2 illustrates a toughness-constraint locus for application of two-parameter fracture mechanics to structures. A structural analysis provides the driving force curve for the configuration of interest, and is plotted with......
- 标准号
- ASTM E2899-15
- 发布
- 2015年
- 发布单位
- 美国材料与试验协会
- 替代标准
- ASTM E2899-19
- 当前最新
- ASTM E2899-19e1
- 引用标准
- ASTM C1421 ASTM E1012 ASTM E111 ASTM E1820 ASTM E1823 ASTM E1921 ASTM E399 ASTM E4 ASTM E6 ASTM E647 ASTM E740 ASTM E8/E8M