Analysis of interactions between test methodology and geometrical factors for a safe and risk adjusted dimensioning of the interface of polycarbonate window and separating safeguard

本研究的目的是分析几何参数对集成聚碳酸酯窗口隔离保护装置安全性的影响。目前机床壳体的尺寸设计依赖于抗侵彻能力。过去对不同材料和不同弹丸的侵彻阻力的研究已经完成，其结果可以在各自的标准中查看。测试用例始终是固定在框架上的测试模式，该框架应该尽可能地僵硬，并且在测试模式的中间有一个冲击点。该方法对确定侵彻阻力具有一定的实用价值，是目前最先进的方法。然而，在工业中存在已知的情况，其中被弹出的物体不能被观看面板保持，因为它从其固定装置松开，从而被弹出的物体和观看面板都离开了机器。目前的标准并不能为这种情况提供安全的解决方案，在研究项目中，只对其进行了随机测试。在研究项目的第一阶段，分析了导致窗户松动的几何参数的影响。从而识别出重要的参数，量化它们的影响，并建立一个数学模型，用来评价某一建筑物的窗户防松动安全性。在第二阶段，研究将扩展到非二次窗和更大的窗。最后，从试验结果中得出施工注意事项，使设计工程师能够在不进行逐个冲击试验的情况下评估和增加集成窗分离防护的安全性。

Aim of the research project is to analyze the influences of geometrical parameters on the safety of a separating safeguard with an integrated polycarbonate window.The dimensioning of a machine tool housing nowadays relies on the penetration resistance. Studies on the penetration resistance of different materials and different projectiles have been accomplished in the past and the results can be viewed in the respective standards. The test case was always a test pattern fixed on a frame which should be as stiff as possible with an impact point in the middle of the test pattern. This procedure has proved of value for the determination of the penetration resistance and is state of the art. However, there are known cases in industry in which ejected objects could not be hold by the viewing panel because it loosened from its fixture, so that the ejected object and the viewing panel both left the machine. Actual standards do not provide safe solutions for this case and in research projects only random tests have been made on it. Construction engineers are depending on own experiences or costly case-by-case reviews.In the first period of the research project, the influence of the geometric parameters that lead to a loosening of the window has been analyzed. Thereby, significant parameters could be identified, their influence quantified and a mathematical model, which allows to evaluate the safety against loosening of the window on a certain construction, could be built. In the second period, the research shall be expanded on non-quadratic and larger windows.Finally, there shall be educed construction notes from the test results, which allow design engineers to evaluate and to increase the safety of separating safeguards with integrated window without case-by-case impact tests.