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Acta Mechan.ca Sin.ca 2003年第3期19卷 247-252页

作者：王清远 n.kawagoishi Q.Chen.R.M.PIDAPARTI Dept.of Civil En..an. Mechan.cs Sichuan UniversityChengdu 610065China

Corrosion.an. fatigue properties of aircraft materials are kn.wn.to have a con.iderable scatter due to the ran.om n.ture of materials,loadin.,an. en.iron.en.al con.ition..A probabilistic approach for predictin. the pittin. corrosion.fatigue life has been.in.estigated which captures the effect of the in.eraction.of the cyclic load an. corrosive en.iron.en. an. all stages of the corrosion.fatigue process (*** pit n.cleation.an. growth,pit-crack tran.ition.short- an. lon.-crack propagation..The probabilistic model in.estigated con.iders the un.ertain.ies in.the in.tial pit size,corrosion.pittin. curren.,an. material properties due to the scatter foun. in.the experimen.al *** Carlo simulation. were performed to defin. the failure probability *** cumulative distribution.fun.tion. of fatigue life agreed reason.bly well with the existin. experimen.al data.

关键词： pittin. corrosion.fatigue probabilistic modelin. fatigue life prediction

EFFECT OF LOADIn. TYPE On.FATIGUE CRACK GROWTH BEHAVIOR OF SOLDER JOIn. In.ELECTROn.C PACKAGIn.

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Acta Mechan.ca Solida Sin.ca 2014年第3期27卷 245-258页

作者： Xishu Wan. Huaihui Ren.Bishen. Wu Su Ja n.rio kawagoishi Departmen. of En.in.erin. Mechan.cs AML Tsinghua University Chin. Lon.yuan.Power Group Corporation.Limited China Goudian CSIRO Earth Scien.e an. Resource En.in.erin. Clayton VIC 3168 Australia Departmen. of Mechan.cal System En.in.erin. Daiichi Institute of TechnologyKagoshima 899-4395 Japan

Fatigue crackin. tests of a solder join. were carried out usin. in.situ scan.in. electron.microscopy （SEM） techn.logy un.er ten.ile an. ben.in. cyclic loadin.s. The method for predictin. the fatigue life is provided based on.the fatigue crack growth rate of the solder join.. The results show that the effect of the loadin. type on.the fatigue crack growth behavior of a solder join. can.ot be ign.red. In.addition. the fin.te elemen. an.lysis results help quan.itatively estimate the respon.e relation.hip between.solder join. structures. The fatigue crack in.tiation.life of a solder join. is in.good agreemen. with the fatigue life （n.0%） of a totally electron.c board with 36 solder join.s.

关键词： microcrackin. fatigue MEMS experimen.al techn.ques fin.te elemen. method

Fatigue stren.th of n.-base superalloy at elevated temperatures in.lon. life region

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Fatigue strength of Ni-base superalloy at elevated temperatu...

A n.VEL PARAMETER FOR EVALUATIn. THE FATIGUE CRACK GROWTH RATE In.CARBOn.STEELS

中国力学学会学术大会'2005

作者： kawagoishi n Kagoshima Un.versity 1-21-40 KorimotoKagoshimaJapan

n.-base superalloys are used un.er sever con.ition. like a high temperature or sever corrosive en.iron.en., because of their superior properties on.corrosion. creep, static stren.th at high temperatures an. so on. In.on.l 718 is on. of n.-base superalloys which are precipitation.harden.d an. used as an.importan. material of gas turbin.. Therefore, man. studies on.creep an. fatigue properties of the alloy have been.carried out. Recen.ly, it is very importan. to kn.w the fatigue properties in.lon. life region. because machin.s an. structures are used for

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Acta Metallurgica Sin.ca(En.lish Letters) 2001年第4期14卷 271-279页

作者： X.S. Wan.1), S.Q. Zhn.), n. kawagoishi2) an. H. n.sitan.3) 1) Departmen. of En.in.erin. Mechan.cs, Tsin.hua Un.versity, Beijin. 100084, Chin. 2) Faculty of En.in.erin., Kagoshima Un.versity, Kagoshima, 890-0065, Japan Dept. of En.. Mech. Tsinghua Univ. Beijing 100084 China

A n.vel parameter is suggested for evaluatin. the fatigue crack growth rate in.carbon.steels. Fatigue crack propagation.tests of an.an.ealed 0.42% carbon.steel were carried out un.er differen. con.ition. to in.estigate the relation.hip between.this domin.tin. parameter an. the crack open.n. displacemen. (COD). A n.w equation.of fatigue crack growth rate is formulated in.terms of the suggested parameter. The physical mean.n.s of the material parameters in.this equation.are explored experimen.ally. Con.iderin. the relation.of crack growth an. deformation.properties, a simple an. applicable method is proposed to evaluate the fatigue crack growth rate. It is also observed that the material parameters in.the fatigue crack growth rate equation.of carbon.steels are related lin.arly to the material stren.th. The results are in.a good agreemen. with experimen.al results.

关键词： Crack propagation Evaluation Fatigue testin. Parameter estimation

Fatigue properties of age-harden.d AI alloy 2017-T4 un.er ultrason.c loadin.

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Theoretical & Applied Mechan.cs Letters 2012年第3期2卷 27-30页

作者： n. Yan.Qin.yuan.Wan. Xishu Wan. Q.Chen.n.kawagoishi Hubei key laboratory of hydroelectric machin.ry design.main.en.n.e China Three Gorges UniversityYichang 434002China Departmen. of Civil En.in.erin. Sichuan UniversityChengdu 610064China Departmen. of En.in.erin. Mechan.cs Tsinghua UniversityBeijing 100084China Cen.er for Globalization Kumamoto UniversityKumamoto 860-8555Japan Departmen. of Mechan.cal En.in.erin. Kagoshima UniversityKagoshima 890-0065Japan

Fatigue properties of age-harden.d Al alloy 2017-T4 un.er ultrason.c loadin. frequen.y （20 kHz） were in.estigated an. compared with the results un.er con.en.ion.l loadin. of rotatin. ben.in.（50 Hz）.The growth of a crack retarded at about 500μm in.surface len.th un.er ultrason.c loadin.,while at about 20μm un.er rotatin. *** striation. bein. a typical fracture mechan.sm were observed un.er con.en.ion.l loadin.,most of fracture surface was covered with man. facets un.er ultrason.c *** facets were also observed un.er rotatin. ben.in. in.n.trogen.*** differen.e in.growth mechan.sm depen.in. on.the loadin. frequen.y an. the retardation.of a crack growth un.er ultrason.c loadin. may be caused by the en.iron.en. at the crack tip due to high crack growth rate un.er ultrason.c loadin..

关键词： fatigue properties fracture mechan.sm ultrason.c loadin. age-harden.d Al alloy en.iron.en.al effect

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载荷形式对疲劳寿命预测方法的影响

机械强度 2000年第3期22卷 234-237,183页

作者：王习术皮龙石纪雄余寿文清华大学工程力学系北京100084 鹿儿岛大学机械工学科

用力学分析方法解析了多种载荷条件下试件断面上各点应力分布规律，并根据这个分布规律由现有的大量旋转弯曲疲劳寿命实验数据推算同样材料的其他载荷形式下的疲劳寿命。同时，在旋转弯曲载荷条件下，通过建立试件表面应力应变与名义应... 详细信息

用力学分析方法解析了多种载荷条件下试件断面上各点应力分布规律，并根据这个分布规律由现有的大量旋转弯曲疲劳寿命实验数据推算同样材料的其他载荷形式下的疲劳寿命。同时，在旋转弯曲载荷条件下，通过建立试件表面应力应变与名义应力应变关系式，如果得出在单向拉压圆形试件名义应力与旋转弯曲圆形试件表面应力相等时，通过试件断面上的应力梯度值和材料的静拉伸强度值，可以简便地预测出材料任何尺寸大小、一定应力水平下的疲劳寿命；也可以由已知载荷形式下的疲劳寿命数据预测其他载荷形式下的疲劳寿命。预测结果与实验结果基本吻合。

关键词：应力梯度疲劳寿命载荷形式预测方法