[[abstract]]本文利用拉普拉斯域之裂紋曳引力與位移基本解以及引用Cagniard-de Hoop積分路徑變換法,來分析垂直表面裂紋受一沿邊界等速移動動力點載荷之動力破壞問題,透過拉普拉斯轉換域中基本解的疊加與映射法的分析,獲得時域中之應力、位移與應力強度因子的完整顯式解,且理論上此解析解適用於應力波經長時間後的探討與分析。數值結果顯示,隨著載荷移動速度越快,相同觀察點所得到的應力值在入射波與反射波通過後則衰退的越快,在三次繞射波與反射波通過後則漸趨於零。而應力強度因子則隨著載荷移動速度加快,在一次繞射波通過後即迅速衰退,在三次繞射波通過後則亦漸趨於零。[[abstract]]In this study, the transient full-field solution of a surface cracksubjected to a dynamic anti-plane moving loading is investigated. Thesolution is determined by superposition of proposed fundamentalsolutions in the Laplace transform domain. The fundamental solutionsto be used are the problems for applying exponentially distributedtraction and screw dislocation on the crack faces and along the cracktip line, respectively. The exact transient closed form solutions ofstresses, displacement, and dynamic stress intensity factor areobtained and expressed in compact formulations. The solutions arevalid for an infinite length of time and have accounted for thecontributions of an infinite number of diffracted and reflected waves.Numerical calculations for a moving loading and a stationary loadingare evaluated and discussed in detail.[[conferencetype]]國內[[conferencedate]]20001209~20001210[[iscallforpapers]]Y[[conferencelocation]]桃園縣, 臺