Detailed explanation of the curve diagram of tensile test machine

Stretched objects can be seen everywhere in life, and these things areTesting machineThe tensile test is achieved by the tensile test machine. The tensile test machine can display six test curves in real time. The specific analysis of each test curve is provided by Jinan Hengsi Shanda Instrument Co., Ltd. as follows:

The stretch curve graph isTesting machineThe drawn tensile curve is actually a load-elongation curve (see figure). If the load coordinate value and elongation coordinate value are divided by the original cross-sectional area of ​​the sample and the gauge distance respectively, a stress-strain curve chart can be obtained. In the pictureopThe part is straight, and the stress and strain are proportional to the ratio, and the ratio is the elastic modulus.Ppis the load when proportional,pPoint stress is proportional limitσp. When loading continues, the curve deviatesop,untileIf the load is removed, the sample can still be restored to its original state.eIf you click the sample, you cannot restore the original state.ePoint stress is elastic limitσe. It is difficult to measure the real one in engineeringσe,The residual elongation of the sample is often taken to reach the original gauge distance0.01The stress at % is the elastic limit,byσ0.01express. Continue to load, sample alongesCurve deformation reachesspoint, this point stress is the yield pointσSOr the residual elongation is0.2% conditional yield strengthσ0.2. PasssContinue to increase the load to the load before the breakbpoint,At this time, the load divided by the original cross-sectional area is the strength limitσb. existbAfter point, the sample continues to elongate, and the cross-sectional area decreases,Load capacity begins to decline,untilkPoint breaks. The ratio of the load at the moment of breaking to the cross section at the breaking point is called the fracture strength.

MoreTensile testing machineTechnical information is all in Jinan Hengsi Shanda Instrument Co., Ltd.