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?安全帽的側向剛性試驗機測試GB/T2812-2006

作者：來源：发布日期： 2020.10.20

信息摘要：

?安全帽的側向剛性試驗機測試GB/T2812-2006

安全帽的侧向刚性，是衡量其质量的重要方面，其测试装置由万能试验机和两个直径为100MM的金屬平板组成。万能试验机的测量精度为1级，金屬平板的硬度要求为45HRC。安全帽的侧向刚性的试验机测试按照国标GB/T2812-2006执行。

測試方法是：將安全帽側放在試驗機兩夾具平板之間，帽沿在外並盡可能靠近平板，試驗機開始加壓，在垂直方向施加30N的力，並保持30秒，記錄此時平板的夾具爲Y1，然後以100N/min的速度加載直至430N，保持30秒，記錄此時平板的間距爲Y2；以100N/min的速度將載荷降至25N，然後立即以100N/min的速度將載荷增加到30N，並保持30秒，記錄此時平板間的間距爲Y3；測量值應精確到1mm，並記錄可能出現的破壞現象，計算Y2與Y1的差值爲最大變形，計算Y3與Y1的差值爲殘余變形。

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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. If this standard is one of exactness and precision, all that is performed, whether it be filing, turning, planing, or drawing, will come to this standard. This faculty of mind can be defined no further than to say that it is an aversion to whatever is imperfect, and a love for what [171] is exact and precise. There is no faculty which has so much to do with success in mechanical pursuits, nor is there any trait more susceptible of cultivation. Methodical exactness, reasoning, and persistence are the powers which lead to proficiency in engineering pursuits. I was the only civilian in that road, and the soldiers, with much curiosity, stared at me. Whenever I noticed an officer, I gave an elaborate military salute, and with such an air that the officers, although hesitating at first, did not fail to return the salute. The reformed system of education was to be not only moral and religious but also severely scientific. The place given to mathematics as the foundation of a right intellectual training is most remarkable, and shows how truly Plato apprehended the conditions under which knowledge is acquired and enlarged. Here, as in other respects, he is, more even than Aristotle, the precursor of Auguste Comte. He arranges the mathematical sciences, so far as they then existed, in their logical order; and his remarks on the most general ideas suggested by astronomy read like a divination of rational mechanics. That a recommendation of such studies should be put into the mouth of Socrates is a striking incongruity. The older Plato grew the farther he seems to have advanced from the humanist to the naturalistic point of view; and, had he been willing to confess it, Hippias and Prodicus were the teachers with whom he finally found himself most in sympathy. We are told that when his end began to approach, the dying philosopher was pressed to choose a successor in the headship of the School. 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