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An asymptotically compatible meshfree quadrature rule for nonlocal problems with applications to peridynamics

Computer Methods in Applied Mechanics and Engineering

Trask, Nathaniel A.; You, Huaiqian; Yu, Yue; Parks, Michael L.

We present a meshfree quadrature rule for compactly supported nonlocal integro-differential equations (IDEs) with radial kernels. We apply this rule to develop a meshfree discretization of a peridynamic solid mechanics model that requires no background mesh. Existing discretizations of peridynamic models have been shown to exhibit a lack of asymptotic compatibility to the corresponding linearly elastic local solution. By posing the quadrature rule as an equality constrained least squares problem, we obtain asymptotically compatible convergence by introducing polynomial reproduction constraints. Our approach naturally handles traction-free conditions, surface effects, and damage modeling for both static and dynamic problems. We demonstrate high-order convergence to the local theory by comparing to manufactured solutions and to cases with crack singularities for which an analytic solution is available. Finally, we verify the applicability of the approach to realistic problems by reproducing high-velocity impact results from the Kalthoff–Winkler experiments.

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TYPE Journal Article YEAR 2019
ScopusOSTIDOI
Results 76–100 of 100
Results 76–100 of 100