（La1-yPry）0.7Ca 0.3Mn 16/18 O3中Griffiths相的形核与相竞争的关系

The "pure-shear" fracture test for viscoelastic elastomers and its revelation on Griffith fracture

Strikingly, "pure-shear" fracture tests have repeatedly shown that fracture nucleation in (common hydrocarbon and other types of) viscoelastic elastomers occurs at a critical stretch that is independent of the stretch rate at which the test is carried out. In this Letter, we demonstrate that this remarkable -- yet overlooked -- experimental finding implies that the Griffith criticality condition that governs nucleation of fracture from large pre-existing cracks in viscoelastic elastomers can be written in fact as an expression not in terms of an elusive loading-history-dependent critical teari…

Griffiths phase and spontaneous exchange bias in La$_{1.5}$Sr$_{0.5}$CoMn$_{0.5}$Fe$_{0.5}$O$_{6}$

La$_{1.5}$Sr$_{0.5}$CoMn$_{0.5}$Fe$_{0.5}$O$_{6}$ (LSCMFO) compound was prepared by solid state reaction and its structural, electronic and magnetic properties were investigated. The material forms in rhombohedral $R\bar{3}c$ structure, and the presence of distinct magnetic interactions leads to the formation of a Griffiths phase above its FM transition temperature (150 K), possibly related to the nucleation of small short-ranged ferromagnetic clusters. At low temperatures, a spin glass-like phase emerges and the system exhibits both the conventional and the spontaneous exchange bias (EB) effe…

考虑材料强度的 Griffith 相场断裂的变分表述

A variational formulation of Griffith phase-field fracture with material strength

本文证明含材料强度的 Griffith 相场断裂 PDE 理论可改写为分别最小化两个泛函的变分理论，为断裂成核与扩展提供统一表述。

Unstable slip pulses and earthquake nucleation as a non-equilibrium first-order phase transition

The onset of rapid slip along initially quiescent frictional interfaces, the process of `earthquake nucleation', and dissipative spatiotemporal slippage dynamics play important roles in a broad range of physical systems. Here we first show that interfaces described by generic friction laws feature stress-dependent steady-state slip pulse solutions, which are unstable in the quasi-1D approximation of thin elastic bodies. We propose that such unstable slip pulses of linear size $L^*$ and characteristic amplitude are `critical nuclei' for rapid slip in a non-equilibrium analogy to equilibrium fir…

考虑强度的脆性断裂相场模型比较：I——混合模式加载

A comparison of phase field models of brittle fracture incorporating strength: I -- Mixed-mode loading

本文系统比较了三种考虑强度的脆性断裂相场模型在II型、III型及混合模式加载下的裂纹扩展预测能力，证实完全形核方法最可靠，并揭示了其他方法在强度面处理和断裂韧性预测上的不足。

裂纹与位错耦合的相场模型：发射、钝化与耗散增韧的必要性

A phase field model of coupled crack and dislocations: emission, blunting, and the necessity of dissipative toughening

本研究构建了裂纹与位错耦合的相场模型，揭示位错发射可屏蔽裂纹但需引入位错运动阈值阻力这类耗散项才能实现增韧的机制。