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arXiv 2509.03468math.APmath.FA
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基于异质视界的非局部超弹性局部边界条件

Local boundary conditions in nonlocal hyperelasticity via heterogeneous horizons

Carolin Kreisbeck, Hidde Schönberger

AI总结:

本文研究含非局部梯度的积分泛函变分问题,通过空间依赖且在边界处消失的相互作用范围实现非局部建模与局部边界条件的融合,建立相关Sobolev空间理论并证明极小元存在性。

摘要:

本文研究一类含非局部梯度的积分泛函变分问题。这类模型是近年提出的经典超弹性改进模型,旨在构建能捕捉不连续和奇异材料效应的有效框架。我们的设置的独特之处在于空间依赖的相互作用范围,该范围在参考域边界处趋于零。这确保了非局部算子仅依赖域内的值,且在边界处退化为经典梯度,从而实现非局部建模与局部边界值的无缝融合。本工作的主要贡献是为新引入的相关Sobolev空间建立了一套完备理论,包括对迹算子和庞加莱不等式的严格处理。我们技术方法的核心是利用与伪微分算子理论的联系。作为应用,我们证明了依赖异质非局部梯度、满足局部Dirichlet、Neumann或混合型边界条件的拟凸或多凸被积函数泛函极小元的存在性。

英文摘要:

In this paper, we consider a class of variational problems with integral functionals involving nonlocal gradients. These models have been recently proposed as refinements of classical hyperelasticity, aiming for an effective framework to capture also discontinuous and singular material effects. Specific to our set-up is a space-dependent interaction range that vanishes at the boundary of the reference domain. This ensures that the nonlocal operator depends only on values within the domain and localizes to the classical gradient at the boundary, which allows for a seamless integration of nonlocal modeling with local boundary values. The main contribution of this work is a comprehensive theory for the newly introduced associated Sobolev spaces, including the rigorous treatment of a trace operator and Poincaré inequalities. A central aspect of our technical approach lies in exploiting connections with pseudo-differential operator theory. As an application, we establish the existence of minimizers for functionals with quasiconvex or polyconvex integrands depending on heterogeneous nonlocal gradients, subject to local Dirichlet, Neumann or mixed-type boundary conditions.

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