Numerical analyses of stress and deformation in sandwich-structured composites

Pulok, Mohammad Khairul Habib; Rahman, Mohammad Shafiqur; Akanda, Md. Abdus Salam

doi:10.1177/0309324720976621

Cited by 2 publications

(1 citation statement)

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“…In addition to strain-strain analysis of plain materials, displacement potential function is also used for stress-strain analysis of different composite materials under various loading conditions. [9][10][11][12][13][14] All these works are formulated with finite difference method (FDM) which establishes that the FDM with the displacement potential function is a very promising technique for the solution of mixed boundary-value problems.…”

Section: Introductionmentioning

confidence: 99%

A mesh refinement scheme for fourth order bi-harmonic equation of mixed boundary-value elastic problems

Khan

Sarkar

Akanda

2022

The Journal of Strain Analysis for Engineering Design

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Fourth order bi-harmonic equation is extensively used for stress-strain analysis of mixed boundary-value elastic problems. However, currently existing uniform mesh scheme based on finite difference method (FDM) needs vast amount of computational resources and efforts for an acceptable solution. Therefore, in this study, a mesh refinement (MR) scheme based on FDM is developed to solve fourth order bi-harmonic equation effectively. The developed MR scheme allows high resolution computation in sub-domains of interest and relatively low resolution in other regions which overcomes the memory exhausting problems associating with the traditional uniform mesh based FDM. In this paper, sub-domain that needs high resolution (mesh refinement) are identified based on gradient of stress and displacement vectors. A very high gradient in any region signifies the need of fine mesh because coarse grained meshes are not adequate to capture the sharply changing stresses or displacements. Once the sub-domains of interest are identified, the mesh refinement is done by splitting course meshes into smaller meshes. Several new stencils are created to satisfy the fourth order by harmonic equation and associated boundary conditions over the various sizes of meshes. The developed MR scheme has been applied to solve several classical mixed boundary-value elastic problems to show its applicability. In addition, the validity, effectiveness, and superiority of the MR scheme have been established by comparing of obtained solutions with uniform mesh results, finite element method (FEM) results, and the well-known analytical results. Our results show that the developed MR scheme can provide a more reliable and accurate result than the conventional uniform mesh scheme with a reduced number of equations, thus, saves a huge amount of computational memory.

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