Correlating fracture toughness and fracture surface roughness via correlation length scale
Correlating fracture toughness and fracture surface roughness via correlation length scale
复制标题
通过相关长度尺度关联断裂韧性和断裂表面粗糙度
DOI：
10.1007/s10704-019-00377-7
复制
发表时间：
2019
影响因子：
2.5
通讯作者：
Shmuel Osovski
中科院分区：
文献类型：
--
作者：
Y. Barak;A. Srivastava;Shmuel Osovski
材料的断裂韧性取决于其微观结构和施加的载荷条件。直觉上，所得的断裂面必须包含关于这些内在（微观结构）和外在（施加载荷）特征的交织的信息。Mandelbrot揭示了断裂表面是分形的，这使得科学界和工程界都感到兴奋，并引发了一系列致力于将断裂韧性和断裂表面粗糙度相关联的工作。不幸的是，这些研究仍然是不确定的，后来它被证明，分形维数的断裂表面粗糙度实际上是普遍的。在这里，我们表明，通过超越的普遍性，断裂韧性和断裂表面粗糙度指数之间的一定的相关性。为此，对铝合金进行了断裂实验，在很宽的加载速率范围内（$10 ^{-2 $>$10 -2-$10 ^{6}\，\mathrm{MPa}\sqrt{\mathrm{m}}\mathrm{s}^{-1 $>$106 MPams-1），并使用立体摄影术重建所得的断裂表面。从重建的表面提取的相关长度，被发现与测得的断裂韧性呈线性相关。在我们的工作中解开的相关性，沿着与建议的机械解释，恢复了相关的断裂韧性和断裂表面粗糙度的希望，允许定量失效分析和潜在的重建方法来设计抗断裂材料。
Fracture toughness of a material depends on its microstructure and the imposed loading conditions. Intuitively, the resultant fracture surfaces must contain the information about the interlacing of these intrinsic (microstructure) and extrinsic (imposed loading) characteristics. Mandelbrot’s revelation that fracture surfaces are fractals, excited both the scientific and engineering communities, spurring a series of works focused at correlating the fracture toughness and the fracture surface roughness. Unfortunately, these studies remained inconclusive and later on it was shown that the fractal dimension of the fracture surface roughness is in fact universal. Here, we show that by going beyond the universality, a definite correlation between the fracture toughness and indices of the fracture surface roughness is obtained. To this end, fracture experiments on an aluminum alloy were carried over a wide range of loading rates ($$10^{-2}$$10-2–$$10^{6}\,\mathrm{MPa}\sqrt{\mathrm{m}}\mathrm{s}^{-1}$$106MPams-1), and the resulting fracture surface were reconstructed using stereography. The correlation lengths, extracted from the reconstructed surfaces, were found to be linearly correlated with the measured fracture toughness. The correlation unraveled in our work, along with the proposed mechanistic interpretation, revives the hope of correlating fracture toughness and fracture surface roughness, allowing quantitative failure analysis and a potential reconstructive approaches to designing fracture resistant materials.
影响因子：
9.4
作者：
Pineau, A.;Benzerga, A. A.;Pardoen, T.
通讯作者：
Pardoen, T.