LC4CS铝合金预腐蚀形貌与剩余寿命评估  

CORROSION MORPHOLOGY AND RESIDUAL LIFE PREDICTION OF CORRODED LC4CS ALUMINUM ALLOY

作　　者：孙辽[1] 姚卫星[2] 

机构地区：[1]南京航空航天大学飞行器先进设计技术国防重点学科实验室,南京210016 [2]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016

出　　处：《机械强度》2014年第2期273-279,共7页Journal of Mechanical Strength

基　　金：国家自然科学基金(51275241)资助~~

摘　　要：研究LC4CS铝合金经EXCO溶液腐蚀后的截面轮廓线,提出了蚀坑特征自动识别和尺寸测量的方法。对预腐蚀件进行疲劳试验,腐蚀严重降低了试件的疲劳寿命。以测得的蚀坑深度h、长宽比AR和截面积As为参数将蚀坑等效成半椭圆和半圆形初始裂纹预测剩余寿命,h和As都是蚀坑等效的有效参数,半椭圆和半圆形裂纹应分别以h、As的平均值和最大值为等效参数。The cross-sectional profiles of pre-corroded LC4CS in EXCO solution were analysed, and a method to identify the pit feature and measure the pit sizes automatically was proposed. Fatigue experiments of pre-corroded specimens were conducted, corrosion has reduced fatigue life observably. The residual life of pre-corroded specimens were predicted by equaling pit damages as semi-elliptic and semi-circular initial cracks using the measured depth h, aspect ratio AR and cross-sectional area As of the pits as equivalence parameters, h and As are effective parameters for pit equivalence, semi-elliptic and semi-circular cracks should use the average and maximum value of h or As as equivalence parameters respectively.

关 键 词：预腐蚀 腐蚀轮廓线 蚀坑尺寸 疲劳试验蚀坑等效剩余寿命预测 

分 类 号：V215.2[航空宇航科学与技术—航空宇航推进理论与工程] O346.2[理学—固体力学]