Tata Institute of Fundamental Research, 36/P, Gopanpally Village, Serilingampally Mandal, Ranga Reddy District, Hyderabad, 500107 Telangana, India.
Department of Chemical and Biological Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
Phys Rev E. 2019 Nov;100(5-1):052110. doi: 10.1103/PhysRevE.100.052110.
Strained amorphous solids often fail mechanically by creating a shear band. It had been understood that the shear-banding instability is usefully described as crossing a spinodal point (with disorder) in an appropriate thermodynamic description. It remained contested, however, whether the spinodal is critical (with divergent correlation length) or not. Here we offer evidence for critical spinodal by using particle pinning. For a finite concentration of pinned particles the correlation length is bounded by the average distance between pinned particles, but without pinning it is bounded by the system size.
应变非晶固体在机械上经常通过产生剪切带而失效。人们已经理解到，在适当的热力学描述中，剪切带不稳定性可以很好地描述为穿过旋节线（无序）。然而，旋节线是否是临界的（具有发散的相关长度）仍然存在争议。在这里，我们通过粒子钉扎提供了临界旋节线存在的证据。对于有限浓度的钉扎粒子，相关长度受到平均钉扎粒子间距的限制，但没有钉扎时，它受到系统尺寸的限制。
