CAJ | 학술논문

运用有限元软件ABAQUS建立压印强化残余应力场的三维有限元模型，模拟计算压印强化过程中2B25-T 351铝合金构件的三维残余应力场分布，模拟结果表明，压印痕底部残余应力沿厚度方向呈梯度分布，与表面距离越远，压应力水平越小。孔周围的残余应力分布比较集中，压印痕端头附近，孔边为相对均匀的残余压应力，其他位置为自平衡的残余拉应力；使用X射线衍射应力分析技术测量实际试样的残余应力，结果表明，实验测量值与有限元模拟值吻合较好；对压印强化前后试样进行疲劳性能试验，结果表明，压印强化在试件表面引入残余压应力，可降低裂纹萌生的几率及裂纹扩展的速率，压印强化后材料的疲劳寿命提高了近1.5倍。
운용유한원연건ABAQUS건립압인강화잔여응력장적삼유유한원모형，모의계산압인강화과정중2B25-T 351려합금구건적삼유잔여응력장분포，모의결과표명，압인흔저부잔여응력연후도방향정제도분포，여표면거리월원，압응력수평월소。공주위적잔여응력분포비교집중，압인흔단두부근，공변위상대균균적잔여압응력，기타위치위자평형적잔여랍응력；사용X사선연사응력분석기술측량실제시양적잔여응력，결과표명，실험측량치여유한원모의치문합교호；대압인강화전후시양진행피로성능시험，결과표명，압인강화재시건표면인입잔여압응력，가강저렬문맹생적궤솔급렬문확전적속솔，압인강화후재료적피로수명제고료근1.5배。
The residual stress field of 2B25-T351 aluminum alloy caused by pressed strengthening was simulated by FEM using ABAQUS . The results show that the residual stress around indentation flaw possesses a gradient distribution across the thick-ness . Far away from the surface , the residual compressive stress decreased towards a stable value . The residual compressive stress around hole shows a centralized distribution , and the self-balanced residual tensile stress is located in other regions . The residual stress of the specimen measured by the X-ray agrees well with the FE simulation result . Furthermore , the effect of the pressed strengthening as the mechanical surface treatment on high cycle fatigue performance was investigated . The results show that pressed strengthening leads to a significant improvement in the fatigue life , and the main reason was that the pressed strengthening causes the residual compressive stress layer by which the crack initiation rate and propagation rate were suppressed .