论文标题

代表具有初始应力和横向纹理各向异性的弹性固体的应力和应变能

Representing the stress and strain energy of elastic solids with initial stress and transverse texture anisotropy

论文作者

Mukherjee, Soumya, Destrade, Michel, Gower, Artur L.

论文摘要

现实世界中的固体,例如岩石,软组织和工程材料,通常在某种形式的压力下。由于其微结构,大多数真实材料在某种程度上也是各向异性的,这种特征通常称为“纹理各向异性”。这种各向异性可能源于多晶材料中的优先谷物对齐,对齐的微裂缝或结构增强,例如生物组织中的胶原蛋白束,预应力混凝土中的钢棒和复合材料中的钢杆。在这里,我们建立了一个具有横向纹理各向异性的最初压力固体的框架。我们认为,参考的每单位质量应变能是弹性变形梯度,初始应力张量和质地各向异性的明确功能。我们确定了相应的本构关系,并开发了非线性应变能的实例,这些示例明确取决于纹理各向异性的初始应力和方向。作为应用,我们采用这些模型来分析具有纹理各向异性的最初应力圆柱体的应力分布,以及焊接金属板的张力。我们还推断出用横向纹理各向异性从应力参考中描述线性弹性所需的弹性模量。例如,我们显示如何用小振幅剪切波测量应力。

Real-world solids, such as rocks, soft tissues, and engineering materials, are often under some form of stress. Most real materials are also, to some degree, anisotropic due to their microstructure, a characteristic often called the `texture anisotropy'. This anisotropy can stem from preferential grain alignment in polycrystalline materials, aligned micro-cracks, or structural reinforcement, such as collagen bundles in biological tissues, steel rods in prestressed concrete and reinforcing fibres in composites. Here we establish a framework for initially stressed solids with transverse texture anisotropy. We consider that the strain energy per unit mass of the reference is an explicit function of the elastic deformation gradient, the initial stress tensor, and the texture anisotropy. We determine the corresponding constitutive relations and develop examples of nonlinear strain energies which depend explicitly on the initial stress and direction of texture anisotropy. As an application, we then employ these models to analyse the stress distribution of an inflated initially stressed cylinder with texture anisotropy, and the tension of a welded metal plate. We also deduce the elastic moduli needed to describe linear elasticity from stress reference with transverse texture anisotropy. As an example we show how to measure the stress with small-amplitude shear waves.

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