
疲劳裂纹扩展检测 - 知乎 - 知乎专栏
为了使用这种方法准确预测裂纹扩展,必须进行测试以获得材料在适当环境条件下的 疲劳裂纹扩展速率 (FCGR)。 根据 巴黎幂律,FCGR 通常表示为 应力强度因子范围 ΔK 的函数: da/dN = A ΔK m [1] 其中 da/dN 是每个循环的裂纹扩展,ΔK 是应力范围、裂纹尺寸和试样几何形状的函数,A 和 m 是需要通过进行疲劳裂纹扩展测试来确定的材料常数。 进行 FCGR 测试有两个公认的标准:ASTM E647 (1) 和 ISO 12108 (2)。 它们在很大程度上是一致的,但两者之间存在一些小的 …
A new bilinear model for fatigue crack growth evaluation
2022年12月1日 · A new bilinear FCG model was established by combining Zhuang's transition point prediction model and Zhu-Xuan threshold prediction model. It has better accuracy in the evaluation of FCG curve compared with existing models like ASME and BS7910.
聚合物基纤维复合材料的分层疲劳增长:一种确定设计和寿命允许 …
现在,在实验室测试中,使用典型的碳纤维增强塑料 (CFRP) 航空航天复合材料的双悬臂梁 (DCB) 测试通常用于获得循环疲劳模式 I 加载下的断裂力学数据。 然而,在裂纹面没有出现大量纤维桥接的情况下,执行这种 DCB 疲劳测试是极其困难的。 这种纤维桥接导致 FCG 速率的显着延迟。 即使对于通常采用的预裂纹延伸长度 ap - a 0 的最小值,也可以看到这种纤维桥接以及由此产生的 FCG 延迟。 DCB 测试的结果也总是表现出相对较大程度的固有散射。 因此,提出了一种方 …
Experimental and numerical investigation on fatigue crack …
2020年9月1日 · The contribution of mode I SIF K I and mode II SIF K II to I-II mixed mode FCG is analyzed by FEM, so as to reveal the change of fracture criterion and crack growth mechanism during the mixed mode FCG process. In addition, the competitive relationship between the two crack closure mechanisms of I-II mixed mode cracks at negative load ratios is ...
通过设计的非对称裂纹扩展试验研究疲劳裂纹扩展速 …
2012年12月1日 · 非对称疲劳裂纹扩展(FCG)测试是专门设计和执行的,以研究在实践中不可避免的非对称裂纹扩展的FCG测试数据是否可用于确定疲劳寿命评估的有效FCG速率信息。 该测试中使用了两种类型的合金,FCG 数据是通过视觉测量获得的。 使用有限元分析软件检验了边界条件和中心孔的影响,结果表明,在工程允许误差范围内,远程均匀拉伸下应力强度因子(SIFs)的理论解对本次试验中的非对称裂纹是有效的。 据此,提出了一种非对称全厚度裂纹FCG率的 …
Modeling the fatigue crack growth of X100 pipeline steel in …
2014年2月1日 · Results of fatigue crack growth tests in gaseous hydrogen as well as fracture morphology are presented in support of the proposed model. The model correlates well with test results and elucidates how the proposed mechanisms contribute to fatigue crack propagation in pipeline steel in environments similar to those found in service. 1. Introduction.
(PDF) Fatigue Crack Growth Behavior in Dissimilar Metal …
2008年1月1日 · FCG rate of HAZ of stainless steel was found to be lowest at low and high ΔK. At intermediate ΔK, WM showed the lowest FCG rate. CS showed higher crack growth rate at all ΔK. However, the...
What is the FRAKT protocol? | frakt.xyz
FRAKT is the first decentralized NFT liquidity protocol on Solana offering both peer-to-pool and peer-to-peer loans. Depositors/lenders provide SOL liquidity to the lending pools and/or to the order books in order to earn Interest, while borrowers are able to borrow SOL instantly using their NFTs as collaterals.
What is Frakt? - Delphi Digital
Frakt is an NFT lending/borrowing protocol on the Solana blockchain that offers various lending products. It is the first decentralized NFT liquidity protocol on Solana, offering both peer-to-pool and peer-to-peer loans. Frakt was Solana’s first generative art collection, launched in June 2021.
FRAKT: Solana's new NFTfi | BULB - bulbapp.io
FRAKT is the first decentralized NFT liquidity protocol on Solana offering both peer-to-pool and peer-to-peer loans
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