首页|45CrNiMoVA高强度合金钢氢致断裂有限元模拟与试验研究分析

45CrNiMoVA高强度合金钢氢致断裂有限元模拟与试验研究分析

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运用ABAQUS有限元软件建立二维CT试样氢扩散和内聚力分析耦合模型,基于氢脆机制理论,采用梯形内聚力本构模型,通过临界氢在裂纹尖端引起氢附着率的变化和与之相关内聚力强度之间的降解耦合关系,模拟了45CrNiMoVA高强度钢CT试样氢致裂纹萌生和断裂.结果显示:金属中的氢原子在静水应力梯度的驱动下富集在高静水应力区域.随扩散时间的增加,氢原子在裂纹尖端富集降低了材料的断裂能从而降低了内聚力强度,使内聚力单元在较低的应力下发生失效,引起材料氢致损伤断裂.模拟得到充氢试样的载荷-位移曲线与实验曲线的大体相同,这说明该模型可在不需要大量试验的条件下对高强度钢氢致断裂进行数值模拟,模拟结果可为该类钢材氢脆断裂失效分析提供借鉴.
Analysis Finite Element Simulation and Experimental Study on Hydrogen Induced Fracture of 45CrNiMoVA High Strength Alloy Steel
The coupling model of hydrogen diffusion and cohesive zone modeling(CZM)analysis of two-dimensional CT specimen were established by ABAQUS software.Based on hydrogen-enhanced decohesion mechanism(HEDE),a trapezoidal traction-separation law(TSL)was adopted,the hydrogen induced crack initiation and fracture on the CT specimen of 45CrNiMoVA high strength steel was simulated by coupling the degradation relationship between hydrogen coverage and critical hydrogen related cohesive stress caused by hydrogen accumulation in metal.The results show that hydrogen atoms in the metal accumulate in the high hydrostatic stress region driven by hydrostatic stress gradient.With the increase of diffusion time,the hydrogen atoms accumulate at the crack tip,which reduces the fracture energy of the material,thus reduces the cohesive stress and makes the cohesive elements fail under lower stress,finally resulting in hydrogen induced fracture failure of the material.The simulation results show that the load-displacement curve of hydrogen-charged specimen is basically the same as the experimental curve,which indicates that the model can be used to simulate the hydrogen induced fracture of high strength steel without a lot of tests.The simulation results can provide reference for the failure analysis of hydrogen embrittlement of the kind of steel.

45CrNiMoVA high strength alloy steelhydrogen embrittlementCT specimencohesive zone modeling(CZM)HEDE(hydrogen-enhanced decohesion)

李云龙、陈波、张克实

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广西大学 土木建筑工程学院 防灾与结构安全重点实验室 广西防灾与工程安全重点实验室,广西 南宁 530004

桂林航天工业学院能源与建筑环境学院,广西 桂林 541004

45CrNiMoVA高强度合金钢 氢脆 CT试样 内聚力模型 氢降低键合力

国家自然科学基金重点项目广西壮族自治区高等学校中青年教师科研基础能力提升项目(2020)

116320072020KY21011

2024

10.14158/j.cnki.1001-3814.20210527

热加工工艺
中国船舶重工集团公司热加工工艺研究所 中国造船工程学会船舶材料学术委员会

热加工工艺

CSTPCD北大核心
影响因子：0.55
ISSN：1001-3814
年,卷(期)：2024.53(2)
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