This is because the mediums are corrosive, which has great requests for test equipments, test specimens, the experimental environment and testers. It is big difficulty to carry out the experiment.
目前国内关于材料在腐蚀环境低周疲劳性能研究数据很少，这是由于介质具有腐蚀性，对试验设备、试样、试验环境及人员都有很高要求，试验难度很大，试验成功者廖廖无几。
参考来源 - A4铝合金锻件腐蚀环境低周疲劳性能试验研究·2,447,543篇论文数据，部分数据来源于NoteExpress
If either of the additional test specimens does not comply with the requirements, the welding procedure test has failed.
如果附加试样的任何一个不符合要求，此焊接试验已经失败。
The additional test specimens can be taken from the same test piece if there is sufficient material or from a new test piece.
附加试样可从同一个试件上切取(如果有足够材料的话)或从一个新试件上切取。
If a tensile test specimen fails to meet the requirements of 7.4.2, two further test specimens shall be obtained for each one that failed.
如果抗拉强度试样不符合7.4.2的要求，对每一个不合格的试样再取两个试样进行试验。
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