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?燒結瓦試驗機標准GB/21149-2007

作者：來源：发布日期： 2020.10.19

信息摘要：

?燒結瓦試驗機標准GB/21149-2007

國標GB/21149-2007標准是試驗機做燒結瓦試驗的方法。

烧结瓦是由粘土或其他无机非金屬原料，经成型，烧结等工艺处理，用于建筑物屋面覆盖及装饰用的板状或块状烧结制品，通常根据形状，表面状态及吸水率不同来进行分类和具体产品命名。

弯曲强度试验机，试验机的相对误差不大于正负1%，能够均匀加荷，支座由放置后互相平行，直径为25mm的金屬棒及下面的支承架成，其中一根可以烧中心轻微上下摆动，别一根可以绕它的轴心稍作旋转，支承架高度约50mm，并能使上面的金屬棒间距可调。压头是一直径为25mm的金屬棒，也可以绕中心上下轻微摆动，支座金屬棒和压头与试样接触部分均垫上厚度为5mm,硬度为邵尔A45度到60度的普通橡胶板。

試驗機材料試驗：

将试样放在支座上，调整支座金屬棒间距，并使压头位于支座金屬的正中。试验前试验机先归零,启动试验机，压头接触试样不得冲击，以50N/S～100 N/S的速度均匀加荷，记录断裂时的最大载荷。

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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. 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