针对刮板输送机工作过程中刮板链张力及运行阻力的检测瓶颈问题,开发了一套基于微应变检测的刮板输送机张力测试系统,通过在刮板中安装应变片及无线信号收发装置实现对刮板链张力的检测,并对不同位置刮板链的张力及运行阻力进行分析。...针对刮板输送机工作过程中刮板链张力及运行阻力的检测瓶颈问题,开发了一套基于微应变检测的刮板输送机张力测试系统,通过在刮板中安装应变片及无线信号收发装置实现对刮板链张力的检测,并对不同位置刮板链的张力及运行阻力进行分析。实验测试结果表明,刮板过链轮时最大瞬时张力为342.681 3 k N,刮板在同一链轮啮入点与啮出点的最大张力差值为46 k N,刮板输送机上端链的最大运行阻力为41.4 k N,下端链运行阻力为22.2 k N,测试结果与现场实际工况基本一致,系统的检测精度与可靠性较高。展开更多
In this paper, ballistic impact tests on wrapped multi-layer Kevlar 49 woven fabric systems were carried out with a flat blade projectile to investigate the impact response during a fan blade out event. The influences...In this paper, ballistic impact tests on wrapped multi-layer Kevlar 49 woven fabric systems were carried out with a flat blade projectile to investigate the impact response during a fan blade out event. The influences of the number of Kevlar layers and pre-tension were discussed particularly. Test results were used to analyze failure modes and energy absorption characteristics of multi-ply Kevlar fabrics. Results show that there are two kinds of impact damage for fabrics： global deformation mainly involving stretching of yarns in the impact region and fabric wrinkle from both sides to the impact zone, and local damage characterized by yarn fracture, yarn pull-out, and yarn unraveling. The energy absorption capability of Kevlar 49 woven fabrics improves with the number of fabric layers. The energy absorbed by multi-layer fabrics increases slightly at the beginning and then decreases substantially with pre-tension. The work in this paper can provide guidance for designing light-weight multi-layer fabrics containment systems.展开更多
文摘针对刮板输送机工作过程中刮板链张力及运行阻力的检测瓶颈问题,开发了一套基于微应变检测的刮板输送机张力测试系统,通过在刮板中安装应变片及无线信号收发装置实现对刮板链张力的检测,并对不同位置刮板链的张力及运行阻力进行分析。实验测试结果表明,刮板过链轮时最大瞬时张力为342.681 3 k N,刮板在同一链轮啮入点与啮出点的最大张力差值为46 k N,刮板输送机上端链的最大运行阻力为41.4 k N,下端链运行阻力为22.2 k N,测试结果与现场实际工况基本一致,系统的检测精度与可靠性较高。
基金co-supported by the National Natural Science Foundation of China (No.51575262)the China Postdoctoral Science Foundation (No.2015M571754)the Aeronautical Science Foundation of China (No.2015ZB52008)
文摘In this paper, ballistic impact tests on wrapped multi-layer Kevlar 49 woven fabric systems were carried out with a flat blade projectile to investigate the impact response during a fan blade out event. The influences of the number of Kevlar layers and pre-tension were discussed particularly. Test results were used to analyze failure modes and energy absorption characteristics of multi-ply Kevlar fabrics. Results show that there are two kinds of impact damage for fabrics： global deformation mainly involving stretching of yarns in the impact region and fabric wrinkle from both sides to the impact zone, and local damage characterized by yarn fracture, yarn pull-out, and yarn unraveling. The energy absorption capability of Kevlar 49 woven fabrics improves with the number of fabric layers. The energy absorbed by multi-layer fabrics increases slightly at the beginning and then decreases substantially with pre-tension. The work in this paper can provide guidance for designing light-weight multi-layer fabrics containment systems.
