Fracture toughness anisotropy of a pyrolytic carbon
Fracture toughness anisotropy of a pyrolytic carbon
复制标题
DOI：
10.1007/bf01114701
复制
发表时间：
1986-05
影响因子：
4.5
通讯作者：
M. Sakai;R. Bradt;D. B. Fischbach
中科院分区：
文献类型：
--
作者：
M. Sakai;R. Bradt;D. B. Fischbach
测量了沉积衬底热解碳的层间解理(SCA)、层间断裂(SBA)和层间断裂(SAB)三种正交断口方向的各向异性弯曲强度、静态杨氏模数和相应的断裂韧性。剥离和剥离断裂均产生光滑的断口表面，Sca和Sab的平均Kc值(MPam1/2)分别为0.53和0.93，与缺口长度无关。观察到了Sbc跨层断裂的不同类型的行为。断裂过程中的分层开裂导致断口表面粗糙，裂纹止裂，以及取决于样品尺寸和裂纹长度的高表观韧性值。讨论了这种诱导分层增韧的本质。
The anisotropic flexural strengths, static Young's moduli and the corresponding fracture toughnesses were measured for the three orthogonal fracture surface orientations,Sca(interlaminar cleavage),SbaandSab(layer rupture across and along the layers, respectively), of an as deposited substrate-nucleated pyrolytic carbon. BothScadelamination andSabalong-layer rupture produced smooth fracture surfaces with meanKlcvalues (MPam1/2) of 0.53 forScaand 0.93 forSab, independent of notch length. A different type of behaviour was observed forSbcacross-layer fracture. Delamination cracking during failure resulted in rough fracture surfaces, crack arrests, and high apparent toughness values dependent on sample size and crack length. The nature of this induced delamination toughening is discussed.