Mechanical and Microstructural Behavior of C-Mnsteel Under Varying Strain Rates
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 7, Issue 3
Abstract
The Prime Objective Of Vehicle Designers Is To Produce Vehicles With Fuel-Economy Along With The Safety Standards Imposed By The Government And Stringent Consumer Demands. It Is Known That Reducing The Weight Of A Vehicle Is A Straight Forward Strategy To Improve Fuel-Economy, But It Can Potentially Create Safety Problems Which In Turn Leads To Increased Use Of High Strength Steel Sheets For The Auto Body Components. C-Mn And DP Steels Consist Of Excellent Combination Of Both Strength And Ductility. High Strain Rate Experiments Are Generally Used To Study The Material Behaviour When These Are Subjected To High Speed Impacts, Like Crash. The Mechanical Behaviour Of These Materials At High Strain Rates Is Considerably Different From That Observed At Quasi-Static Loading Because Of The Strain Rate Sensitivity Of The Material. Hence, Automotive Industries Are Continuously Engaged With Designing Newer Materials For Car Body Applications. In This Investigation, Many Quasi Static Tensile Experiments Were Carried Out At Various Strain Rates On C-Mn 440 Steel At Ambient Temperature. It Has Been Observed That Yield And Tensile Strengths Of The Material Increase Drastically While %EL And %RA Significantly Decrease With The Strain Rate. The Fracture Surface Reveals Dimple Morphology With Variation Of Dimple Geometry With Strain Rate; Average Dimple Diameter Increases And Dimple Density Decreases With Strain Rate. The Void Accumulation (I.E., Void Density) Inside The Material Increases With The Increase In True Strain For All The Strain Rates. At The Initial Stage Of Strain, Void Density Increases Slowly And At The Later Stage, Void Density Increases Rapidly.
Authors and Affiliations
Awanish Kumar Mishra, Saurabh Srivastva, Saurabhkumar Singh
Keywords
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