蠕变条件下弯曲荷载作用下多嵌埋裂纹的相互作用行为

IF 1.5 4区 工程技术 Q3 MECHANICS Journal of Mechanics Pub Date : 2023-05-11 DOI:10.1093/jom/ufad005
Zhifang Gao, Lei Zhao
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引用次数: 0

摘要

制造/安装过程中预先存在的缺陷或引发的小裂纹产生的多个裂纹是评估结构完整性的主要问题。在本研究中,采用数值模拟方法研究了蠕变状态下共面多个嵌入裂纹在弯曲载荷作用下的相互作用行为。基于三维有限元解,评估了裂纹形态(裂纹形状、裂纹深度和裂纹距离)和蠕变特性对蠕变相互作用因子和C*沿嵌入裂纹分布的影响。由于多个裂纹之间的相互作用,C*沿裂纹前沿分布不对称,并且随着裂纹相互靠近,C*值显著。此外,裂纹深度、裂纹距离和蠕变指数对蠕变相互作用因子有显著影响,而裂纹形状的影响有限。然而,最大蠕变相互作用因子与沿裂纹前缘出现的最大C*值不一致。采用由沿裂纹前缘的平均C*值确定的蠕变相互作用因子来表示多个嵌入裂纹对裂纹扩展行为的强度效应。最后,提出了一个估算嵌入裂纹蠕变相互作用因子的经验关系式。
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Interaction behavior for multiple embedded cracks subjected to bending load in creep regimes
Multiple cracks grow from pre-existing defects during the manufacturing/installation process or from small cracks initiated are primary concerns in evaluating the structural integrity. In this study, the interaction behavior for coplanar multiple embedded cracks subjected to bending load in creep regimes was studied using numerical simulation approach. Influences of crack configurations (crack shape, crack depth and crack distance) and creep properties on creep interaction factor and C* distribution along the embedded cracks were evaluated based on the three-dimensional finite element solutions. Due to the interaction among the multiple cracks, the C* distribution was asymmetric along the crack front and the C* values were pronounced as the cracks approached each other. Moreover, crack depth, crack distance and creep exponent significantly affected the creep interaction factor and crack shape had limited influence. However, the maximum creep interaction factor did not coincide with the maximum C* values occurring along the crack front. The creep interaction factor determined by the average C* values along the crack front was employed to represent the intensity effect of multiple embedded cracks on the crack growth behavior. Finally, an empirical relation was proposed for estimating crack creep interaction factors of embedded cracks.
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来源期刊
Journal of Mechanics
Journal of Mechanics 物理-力学
CiteScore
3.20
自引率
11.80%
发文量
20
审稿时长
6 months
期刊介绍: The objective of the Journal of Mechanics is to provide an international forum to foster exchange of ideas among mechanics communities in different parts of world. The Journal of Mechanics publishes original research in all fields of theoretical and applied mechanics. The Journal especially welcomes papers that are related to recent technological advances. The contributions, which may be analytical, experimental or numerical, should be of significance to the progress of mechanics. Papers which are merely illustrations of established principles and procedures will generally not be accepted. Reports that are of technical interest are published as short articles. Review articles are published only by invitation.
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