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A Study on the Evolution of Subsequent Yield Surfaces for Ductile Cast Iron Under Different Pre-Deformation Loading
Shihong Huang1, Shenghuan Qin1, Jie Pang1
1Department of Management Science and Engineering, Guangxi University of Finance and Economics, Nanning 530007, China.
Materials (Basel, Switzerland)
|May 27, 2026
Summary
This study reveals how ductile cast iron
Area of Science:
- Materials Science
- Mechanical Engineering
- Solid Mechanics
Background:
- Understanding the mechanical behavior of materials under complex loading conditions is crucial for structural integrity.
- Ductile cast iron (QT600-7) is widely used in engineering applications, necessitating a thorough investigation of its material properties.
- The evolution of yield surfaces under various pre-deformation histories significantly impacts material performance and failure prediction.
Purpose of the Study:
- To experimentally investigate and characterize the subsequent yield surfaces of thin-walled tubular ductile cast iron (QT600-7) specimens.
- To elucidate the evolution patterns of these yield surfaces under diverse pre-deformation histories.
- To analyze the effects of pre-deformation level, unloading position, and loading path on yield surface evolution, focusing on the concave phenomenon.
Main Methods:
- Experimental investigation of thin-walled tubular ductile cast iron (QT600-7) specimens.
- Application of various pre-deformation histories, including different pre-loading paths and offset strains.
- Detailed measurement and analysis of subsequent yield surfaces, including translation, distortion, and the concave phenomenon.
Main Results:
- Subsequent yield surfaces of QT600-7 translate towards the pre-loading direction.
- Translation and distortion are more pronounced at smaller offset strains, diminishing with increasing offset strains.
- A concave phenomenon is observed, particularly at small offset strains, influenced by pre-loading path and pre-deformation level. Reverse compression after pre-tension can lead to complex shapes.
Conclusions:
- The yield surface evolution in ductile cast iron is highly dependent on pre-deformation history.
- The observed concave phenomenon is a critical feature influenced by loading path and strain level.
- Accurate modeling of these complex yield surface behaviors is essential for predicting the performance of QT600-7 components under cyclic or complex loading.
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