Explosion inside the pipe using CONWEP method in Abaqus

Product Overview

In this example, we simulate the internal explosive loading of a steel pipe using the CONWEP method in Abaqus.

The effect of different explosive masses, including 400, 600, and 800 grams of PE4, is investigated. The resulting hoop plastic strain obtained from the Abaqus simulations is compared with the results reported in the reference study.

The CONWEP method is commonly used for simulating explosion and air-blast loading. In this problem, an explosive charge is located at the center of the pipe, and the effect of the explosion on the pipe is investigated.

Model Description

In this simulation, the explosive material is PE4, which is positioned at the center of the pipe. The explosion generates an internal blast load that acts on the inner surface of the pipe.

The steel pipe is 800 mm long, with an outer diameter of 324 mm and a wall thickness of 9.5 mm. and both ends of the pipe are open.

CONWEP Method

The explosion load is defined using the CONWEP method available in Abaqus. This method allows the blast effect of an explosive charge to be applied to the pipe without explicitly modeling the explosive material and surrounding air.

With this method, there is no need to define the geometry or material properties of the explosive. Instead, the explosive mass and its location are specified in the Abaqus model to define the blast loading.

Effect of Different Explosive Masses

The analysis is performed for different explosive masses to investigate their effect on the response of the steel pipe.

Three simulations are performed using 400 grams, 600 grams, and 800 grams of PE4. The resulting pipe deformation and hoop plastic strain are obtained from the Abaqus simulations and compared for the different explosive masses.

Hoop Plastic Strain

The hoop direction is the circumferential direction around the pipe. When the pipe is subjected to internal blast loading, the high internal pressure causes the pipe wall to expand radially, producing stress and strain in the hoop direction.

In this project, the hoop plastic strain is obtained from the Abaqus results for different explosive masses. The resulting values are used to evaluate the plastic response of the pipe and to compare the numerical results with the corresponding results reported in the reference study.

Comparison of Abaqus Results with Article Results

The hoop plastic strain results obtained from Abaqus are compared with the results reported in the reference article.

The comparison demonstrates that the numerical results obtained from the Abaqus model are in good agreement with the corresponding results reported in the article.

Validation

This project has been validated, which means that the results obtained from the Abaqus software are similar to the results reported in the reference article.

In other words, this project is based on the reference research article, and the numerical results obtained from Abaqus are compared with the reported results.

What You Will Learn

• How to simulate an explosion inside a pipe in Abaqus.
• How to use the CONWEP method for explosion loading.
• How to define an explosive charge using PE4.
• How to position the explosive charge at the center of a pipe.
• How to simulate the effect of an internal explosion on a pipe.
• How to analyze different explosive masses.
• How to analyze 400, 600, and 800 grams of PE4.
• How to obtain hoop plastic strain from Abaqus results.
• How to plot the hoop plastic strain results.
• How to compare Abaqus results with the results of a reference article.
• How to validate an explosion simulation using published results.

Key Features

• Explosion inside a pipe.
• CONWEP explosion analysis.
• PE4 explosive material.
• Explosive charge located at the center of the pipe.
• Analysis of 400 grams of PE4.
• Analysis of 600 grams of PE4.
• Analysis of 800 grams of PE4.
• Hoop plastic strain calculation.
• Comparison of Abaqus results with article results.
• Validation against the reference article.
• Complete Abaqus CAE file.
• Abaqus INP file.
• Excel file containing results.
• Reference research paper.
• Step-by-step video tutorial.

Reference

This project is based on a reference research article. The research paper is included with the project files and can be used to review the explosion loading, numerical model, and reported results.