建筑用钢筋及其焊接接头和冷拉钢筋的品种、规格繁多:进行力学性能检验时不要求加工成标准试样。所以,在弯曲试验时需要一套各种直径的弯曲试验用弯芯,才能符合试验规程要求。目前,万能材料试验机所带的弯芯规格太少,远远不能满足需要。这样,常常以大代小或以小代大,给试 There are many varieties and specifications of steel bars, welded joints and cold-drawn steel bars used in construction. It is not required to process into standard samples when performing mechanical performance tests. Therefore, a set of bending test bending cores of various diameters are required to meet the test procedure requirements. At present, the specifications of the cores taken by the universal material testing machine are too small to meet the needs. In this way, it is often given in large or small generations.