Abstract
The paper investigates the elastic behavior of the metal after unloading. For this purpose the strip of metal with tensile gauge length was simulated with high and low strength material. Further the channel forming was modeled for combination of materials to predict the spring-back and compared the results. It is observed that the Young’s modulus (E-value) decreases with the increase in plastic strain. The strength of the material has no effect on the decrease in the E-value after unloading during tension test. However in channel forming the E-value after unloading depends on the starting E-value, spring-back angle and maximum strain achieved in the channel. The proposed mathematical equations to determine the E-value after unloading from the tension test and channel forming test gives very good prediction with each other. It is also found that the lowest spring-back occurred in the channel with the composite Hard-Soft material.
Highlights
The shape change of the deformed component after unloading is called the elastic recovery
It was observed that the E-value after unloading in longitudinal tension test depends on the starting E-value and has no effect of strength level of the material
Further the spring-back prediction was studied with the channel forming model
Summary
The shape change of the deformed component after unloading is called the elastic recovery This behavior is been named as the spring-back in sheet metal stamping. The shape error due to the spring-back considers as the manufacturing defect in sheet metal forming process Another definition of the spring-back is referred to as the undesirable change of part shape that occurs upon removal of constraints after forming [3]. It can be considered a dimensional change which happens during unloading, due to the occurrence of primarily elastic recovery of the part
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