1.1 本试验方法包括使用自由下落重量在规定的冲击条件下测定整体聚碳酸酯板材引发失效所需的能量。 1.2 两种试样类型的定义如下: 1.2.1 A型 由平板试样组成，并采用夹紧环支撑。 1.2.2 B型 由一个简单支撑的三点加载梁试样组成( 图1 )用于使用A类试样不会失效的材料。最大跌落高度为6.096 m（20 ft），最大跌落重量为22.68 kg（50 lb），大于12.70 mm的原始聚碳酸酯( 1. / 2. 英寸）厚的试样将需要使用B型试样。 注1: 另见ASTM方法: 第1709页 , 第2444页 和 第3029页 . 图1 B型试样几何形状和荷载 1.3 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.3.1 例外情况- 英寸- 括号中的磅单位仅供参考。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体危害说明，请参阅第节 7. . 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 本试验方法适用于定性评估涂覆和未涂覆的整体聚碳酸酯板材，用于监控过程控制，用于筛选研究，并有助于预测暴露于冲击使用条件下的硬件性能。 5.2 A类试样试验的一个限制是，由于可用冲击能量受试验装置的最大跌落高度和跌落重量的限制，厚薄板可能不会失效。对于小于12.7的材料，使用A型试样 mm（0.50英寸）厚。 5.3 在该系统的跌落高度范围内，使用不同速度的试验预计不会产生不同的结果。然而，对于给定的一系列试验，跌落高度应保持恒定，以便冲击速度（应变率）不会是一个变量。 5.4 由于聚碳酸酯试样在冲击下发生了较大的塑性变形，因此向下（相反的冲击）侧承受拉伸载荷，对初始破坏影响最大。因此，一面涂层的聚碳酸酯板应在涂层面朝下的情况下进行测试。 5.5 不应尝试直接比较A型试样和B型试样的试验结果。对于需要比较实验室间试验结果的试验程序，必须规定试样类型和近似跌落高度。 5.6 单片聚碳酸酯板对缺口敏感。从其他试验方法获得的数据，特别是缺口Izod/Charpy试验结果和极高或极低应变率试验结果，不应直接与从该方法获得的结果进行比较。值得注意的是，无缺陷的A型试样未经历厚度小于3.18 mm的薄试样之间的特征延性到脆性转变( 1. / 8. 英寸），厚度大于7.94 mm( 5. / 16 英寸），其他测试方法所反映的板材。

1.1 This test method covers the determination of the energy required to initiate failure in monolithic polycarbonate sheet material under specified conditions of impact using a free falling weight. 1.2 Two specimen types are defined as follows: 1.2.1 Type A consists of a flat plate test specimen and employs a clamped ring support. 1.2.2 Type B consists of a simply supported three-point loaded beam specimen ( Fig. 1 ) for use with material which can not be failed using the Type A specimen. For a maximum drop height of 6.096 m (20 ft) and a maximum drop weight of 22.68 kg (50 lb), virgin polycarbonate greater than 12.70 mm ( 1 / 2 in.) thick will require use of the Type B specimen. Note 1: See also ASTM Methods: D1709 , D2444 and D3029 . FIG. 1 Type B Specimen Geometry and Loading 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3.1 Exception— The inch-pound units in parentheses are provided for information only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statement, See Section 7 . 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is applicable for qualitatively evaluating coated and uncoated monolithic polycarbonate sheet material, for monitoring process control, for screening studies, and as an aid in the prediction of hardware performance when exposed to impact service conditions. 5.2 A limitation of Type A specimen testing is that a thick sheet may not fail since the available impact energy is limited by the maximum drop height and falling weight capacity of the test apparatus. Use Specimen Type A for material less than 12.7 mm (0.50 in.) thick. 5.3 Within the range of drop heights of this system, tests employing different velocities are not expected to produce different results. However, for a given series of tests, the drop height should be held constant so that velocity of impact (strain rate) will not be a variable. 5.4 As the polycarbonate specimen undergoes large plastic deformation under impact, the down (opposite impact) side is under tensile loading and most influential in initiating failure. For that reason, polycarbonate sheet coated on one side should be tested with the coated side down. 5.5 Direct comparison of specimen Type A and specimen Type B test results should not be attempted. For test programs that will require the comparison of interlaboratory test results the specimen type and the approximate drop height must be specified. 5.6 Monolithic polycarbonate sheet is notch sensitive. Data obtained from other test methods, particularly notched Izod/Charpy test results, and extremely high- or low-strain rate test results, should not be compared directly to data obtained from this method. It is noted that Type A specimens, free of flaws, have not experienced the characteristic ductile-to-brittle transition between thin, less than 3.18 mm ( 1 / 8 in.), and thick, greater than 7.94 mm ( 5 / 16 in.), sheet as reflected by other test methods.