Experimental technique of the simple plane shear has been described and the results obtained for steels applied in the car industry have been presented. The stress, the strain and temperature changes, in the range of strain rate 10~(-3) s~(-1) ÷ 10~1 s~(-1), were studied. The shear process has been carried out in a specially designed grip, which allows to replace the compression into a simple shear. This grip was fitted in the testing machine. A change of temperature of the surface of the sample has been observed during the shear test using an infrared camera. A correlation between the mechanical and the temperature characteristics of steels shows that the temperature increments during simple shear tests depend on the kind of material and grow with both the increasing stress and the increasing shear rate. At the rate equal to 10~1 s~(-1), the temperature increment has reached 100 K; locally, these increments can be significantly higher and can influence the deformation process.
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