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GB/T 29459.2-2012 在役承压设备金屬材料小冲杆试验机压缩测试

作者：來源：发布日期： 2020.10.21

信息摘要：

GB/T 29459.2-2012 在役承压设备金屬材料小冲杆试验机压缩测试

GB/T 29459.2-2012 在役承压设备金屬材料小冲杆试验方法第2部分：室温下拉伸性能的试验方法将于2013年7月起实施，它规定了此类材料通过试验机如何测定力学性能参数。

在役承压设备金屬材料一般指存在于火电、核电、石化、冶金行业的在役锅炉、压力容器、压力管道领域所用的承压设备，材料长期在高温下服役，或受到不同程度的损伤和性能退化，测试这些材料的状况和预测寿命，对于这些行业非常重要。

傳統的試驗方法一般是破壞性地取樣，而小沖杆試驗所需的試樣十分微小，近似于無損取樣。

除有特殊要求外，試驗應在10~35攝氏度的室溫下的實驗室中進行。

試驗加載過程：通過放置在試樣上的鋼珠或沖杆的沖頭，對試樣的中心施加一個向下的載荷，試樣的變形隨著載荷的增大而逐漸增大，直至破裂，如圖1.記錄試樣薄片從變形到失效整個過程中的加載載荷和位移數據，生成圖2所示的載荷~位移曲線，通過對此曲線的分析和經驗關聯換算，就可以獲得材料的各項常規拉伸性能指標。

斷後試樣的形態如圖3.

根據載荷的大小，選擇相應力值範圍的試驗機來完成上述試驗。

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The Curate, of course, had heard nothing about the Clockwork man's other performances; he had scarcely heeded the hints thrown out about the possibility of movement in other dimensions. It seemed to him, in the uncertain light of their surroundings, that the Clockwork man's right arm gradually disappeared into space. There was no arm there at all. Afterwards, he remembered a brief moment when the arm had begun to grow vague and transparent; it was moving very rapidly, in some direction, neither up nor down, nor this way or that, but along some shadowy plane. Then it went into nothing, evaporated from view. And just as suddenly, it swung back into the plane of the curate's vision, and the hand at the end of it grasped a silk hat. Good fitting is often not so much a question of skill as of the standard which a workman has fixed in his mind, and to which all that he does will more or less conform. 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