Step universal tensile testing machine on the bare wire detection is? You know it testing steps?Some detailed steps below is the constant Ji'nan hengsishengda records.
First, the scope of force
The tensile properties of universal tensile testing machine bare wire pull test method is mainly used for testing of wire and other metal conductor and bare wire. Test method for a certain length of the fixture is under increasing tensile fracture, know so far.
Second, test equipment
Tensile testing machine, its error is not more than plus or minus one percent.
Third, test preparation
@1, solid core conductor
1 sampling: prepare samples qualified 3, sampling time, to avoid the specimen under tensile,bending and torsion or other damage.
2 straightening specimen: careful manual correction, when necessary, can use the gavel knock lightly straight, when testing the tensile and compressive strength, can not straightening.
3 mark the gauge length: mark in the middle clamp test gauge length 200mm. Can't makespecimens of early fracture lines should be clear. Standard error of length: hard wire specimens for positive and negative 0.2mm, cord specimens for positive and negative 0.5mm.
@2, a stranded conductor
1 sampling: samples from visual inspection qualified from 3 specimens, the length of the specimen to the original gauge length of two times the jaw clamping length.
2 specimen processing: Unlock the specimen at both ends of the wire, and bent into a circledivided hook, after cleaning, using low melting alloy or resin on vertebral end. Also availablecrimping method or clamp method.
@3, the test procedure
1 specimen held in universal tensile testing machine of the jaw, mark line should be revealed inthe jaw. After clamping position of test pieces shall ensure the test axis and the drawing centerline.
2 the selected drawing speed
3 start the universal tensile testing machine, loading must be smooth, uniform speed, no impact.
4 when the specimens were tensile fracture after reading and record the maximum load, three five effective number. Remove the specimen will fracture careful alignment, squeezing, measure and record the final gauge length.