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Research on the Springback Behavior of 316LN Stainless Steel in Micro-Scale Bending Processes
Shubiao Guo1,2, Chenchen Tian1,2, Haitao Pan1,2
1Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, China.
Materials (Basel, Switzerland)
|September 23, 2022
Summary
Accurately calculating the springback angle of micro-scale metallic bipolar plates is crucial for fuel cell efficiency. A new constitutive model considering grain size and strain gradient improves springback angle prediction in micro-forming.
Area of Science:
- Materials Science
- Mechanical Engineering
- Energy Storage
Background:
- Metallic bipolar plates are essential components in hydrogen fuel cells, impacting overall cell efficiency.
- Accurate forming of micro-scale metallic bipolar plates is challenged by springback behavior, a phenomenon not well-explained by current elastoplastic theories.
- Precise springback angle calculation is vital for the manufacturability and performance of these critical fuel cell components.
Purpose of the Study:
- To develop an accurate constitutive model for predicting the springback angle in micro-scale metallic bipolar plate forming.
- To investigate the influence of grain size and strain gradient effects on micro-scale bending behavior.
- To validate the proposed model through experimental verification.
Main Methods:
- Development of a novel constitutive model incorporating grain size and strain gradient effects.
- Design and utilization of a specialized micro-scale four-point bending tool for simplified springback angle measurement.
- Conducting micro-bending experiments on 0.1 mm thick 316LN stainless steel sheets.
Main Results:
- The proposed constitutive model accurately predicts springback angles in micro-scale sheet metal forming.
- Experimental results validate the model's effectiveness in analyzing micro-bending behavior.
- The specialized bending tool simplifies the process of calculating springback angles.
Conclusions:
- The developed constitutive model provides a reliable method for calculating springback angles in micro-scale metallic bipolar plates.
- This advancement is critical for improving the forming accuracy and efficiency of hydrogen fuel cell components.
- The study offers a pathway to overcome limitations in existing elastoplastic theories for micro-forming applications.
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