利用二階攝動(dòng)方法研究了靜載荷作用下結(jié)構(gòu)線(xiàn)彈性裂紋的彎曲擴(kuò)展問(wèn)題、裂紋路徑預(yù)測(cè)時(shí)的應(yīng)力準(zhǔn)則與能量準(zhǔn)則之間的關(guān)系,并求解出三維靜態(tài)應(yīng)力強(qiáng)度因子.歸納總結(jié)出三維線(xiàn)彈性彎曲裂紋擴(kuò)展的判據(jù),求解出三維線(xiàn)彈性彎曲裂紋擴(kuò)展過(guò)程中的形狀參數(shù).利用Irwin公式計(jì)算出三維彎曲裂紋擴(kuò)展引起的靜態(tài)能量釋放速率.研究了具有非均勻斷裂韌性的材料的三維靜態(tài)彎曲裂紋.就均勻物質(zhì)而言,在二階攝動(dòng)分析理論的框架內(nèi),兩種準(zhǔn)則指明了相同的三維靜荷載彎曲裂紋擴(kuò)展路徑.但在具有非均勻斷裂韌度的物質(zhì)中,能量準(zhǔn)則優(yōu)越于應(yīng)力準(zhǔn)則.對(duì)三維靜態(tài)彎曲裂紋路徑失穩(wěn)因素進(jìn)行了比較和分析,研究了不同初始三維裂紋長(zhǎng)度下材料退化與靜施應(yīng)力或外靜應(yīng)力之間的臨界關(guān)系. 

【文章頁(yè)數(shù)】：8 頁(yè)

【文章目錄】：
0 Introduction
1 Approximate description of a three-dimensional curved crack in a finite body receiving static load
    1.1 Modification of the second order perturbation solution to a three-dimensional curved crack
    1.2 Criterion of the three-dimensional curved static crack unsteady extending
2 Discussion on static crack path criteria
    2.1 Static energy release rate
    2.2 The effects of inhomogeneous distribution of three-dimensional static fracture toughness
3 The three-dimensional curved crack path prediction of brittle fracture in weldment under static load
    3.1 An analytical model of a linear elasticity crack in weldment
    3.2 Three-dimensional static crack path prediction
    3.3 Results and discussions
4 Conclusion


【參考文獻(xiàn)】：
期刊論文
[1]動(dòng)態(tài)載荷作用下焊接點(diǎn)線(xiàn)彈性裂紋的彎曲擴(kuò)展路徑的預(yù)測(cè)(英文)[J]. 楊大鵬,張雪艷,趙耀,白玲,趙輝.  船舶力學(xué). 2012(03)
[2]結(jié)構(gòu)裂紋故障振動(dòng)檢測(cè)的小波分析[J]. 張維峰,馮華.  力學(xué)與實(shí)踐. 2010(01)
[3]管線(xiàn)鋼表面裂紋體的三維斷裂特性和斷裂判據(jù)研究[J]. 趙新偉,羅金恒,楊政,張華,張廣利.  機(jī)械強(qiáng)度. 2009(04)



本文編號(hào)：3706751