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首页> 外文会议>49th International wood composites symposium >1. Non-destructive detection and monitoring of durability issues in full-scale wall envelopes under accelerated weathering
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1. Non-destructive detection and monitoring of durability issues in full-scale wall envelopes under accelerated weathering

机译：1.在加速风化条件下无损检测和监测全尺寸墙体中的耐久性问题

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Many wood composites are known to poorly resist the effects of moisture and temperature extremes over time. Durability and weather resistance of wood composites are traditionally evaluated by long-time experiments. Duration of testing and efforts to assess the performance of wood composites constrain the development of new products and applications.rnAccelerated weathering technologies shorten the process of time-dependent effects of natural weather exposure and can be applied to simulate regional weather characteristics. The multi-chamber modular environmental conditioning (MCMEC) system at Oregon State University is capable of exposing full scale wall elements to specific patterns of temperature, moisture and ultraviolet-radiation. Degradation and excessive shrinking and swelling alter the interfacial boundaries, a critical performance factor. Acousto- ultrasonics and dielectric analysis are applied to non-destructively detect and monitor weather related chemical and structural changes.rnThe outcome of this study can drastically shorten the process of durability testing and clear the way for the development and placement of new wood composites.
机译：众所周知，许多木材复合材料随着时间的流逝都无法很好地抵抗水分和极端温度的影响。传统上，木材复合材料的耐久性和耐候性是通过长时间的实验来评估的。测试的持续时间和评估木质复合材料性能的努力限制了新产品和新应用的开发。加速的风化技术缩短了自然暴露于时间的影响过程，可用于模拟区域天气特征。俄勒冈州立大学的多室模块化环境调节（MCMEC）系统能够使全尺寸墙体元件暴露于特定的温度，湿度和紫外线辐射模式。降解以及过度的收缩和溶胀会改变界面边界，这是关键的性能因素。超声和介电分析被用于无损检测和监测与天气相关的化学和结构变化。这项研究的结果可以大大缩短耐久性测试的过程，并为新型木质复合材料的开发和放置铺平道路。

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