ANSYS与ABAQUS比较之实例8---带孔平板的热应力分析1

A Comparative Study of ANSYS and ABAQUS in Thermal Stress Analysis: A Case Study on a Pierced Plate Structure

Abstract

In this study, Thermal Stress Analysis was conducted using the finite element software ABAQUS on a specific structure—a pierced plate, to determine the stress distribution within the component when subjected to temperature changes. This paper represents the first part of a series that will also compare the same analysis scenario using ANSYS, thus enabling a comparative analysis of the methodologies, capabilities, and potential advantages/disadvantages of using either ABAQUS or ANSYS for thermal stress calculations in complex structures.

Problem Description

A soil dam structure incorporating a pierced plate is under consideration, characterized by:

Geometry and Support: Equipped with horizontal clamping on the upper surface and rolling supports on each side.

Initial Conditions: Starting at a uniform temperature of 25 degrees Celsius.

Temperature Target: Target is to assess the temperature condition when increased to 150 degrees Celsius.

Material Properties: Given as elastic modulus of \(2 \times 10^9\) Pa, Poisson's ratio of 0.3, and a linear thermal expansion coefficient of \(1.35 \times 10^{5}\) per degree Celsius.




Analysis and Problem Understanding

Type of Analysis: Analyzed as a planar stress problem, where thermal stress stems from changes in material expansion leading to constrained strain, which in turn, generates stress.

NonLinearity Considerations: The case is a nearly ideal linearelastic analysis scenario, involving just one object, without contact, material, or geometric nonlinearities.

Geometric Modeling: Due to the symmetric nature of the structure with regards to its left and right edges, analysis was conducted on a crosssectional plane.

Boundary Conditions: Applied displacement constraints at the top surface, and an initially uniform temperature of 25 degrees Celsius. In a subsequent analysis step, the temperature is adjusted to 150 degrees Celsius.

Computational Approach

Component Creation: Initially, only half of the structure was modeled, a 2D deformable component, deemed appropriate given the symmetry.

Material Properties Definition: Only the modulus, Poisson's ratio, and thermal expansion constant were specified for subsequent analyses.

Section Properties Assignment: Developed a homogenous rectangular crosssection, and transferred the aforementioned material properties to it, before integrating it into the main model.

Assembly Discretization: Uniquely modeled components were integrated into an assembled model.

Analysis Step Configuration: Defined two distinct analysis steps to capture the gradual temperature increase. The first step applies the initial conditions, and the second step applies the elevated temperature.

Force Application and Boundary Specification: Early loading was confined to suppression of unconstrained translational displacements along the Xaxis. A predefined field was used to impose the initial temperature of 25 degrees Celsius, which transitions to 150 degrees Celsius during the first analysis phase.

Meshing: Utilization of a 2 mm element size resulted in the discretization of the model.

Job Submission and Result Analysis: Job execution began after defining various computational parameters, culminating in the retrieval of the temperature and stress results under the prismatic surface's final thermal state of 150 degrees Celsius.

Conclusion

The study concluded that maximum stress at the points of temperature gradient concentration reached approximately 5.5 MPa, highlighting the critical aspects of thermal stress for such structures under varying temperatures. This foundational analysis using ABAQUS exemplifies alternative procedures for thermal stress investigations, paving the way for subsequent comparative analyses utilizing both the ABAQUS and ANSYS platforms, thereby enriching the understanding of numerical prediction techniques for thermal stress scenarios.

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