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利用中国矿业大学(北京)霍普金森压杆实验室的50 mmSHPB实验装置系统,对石灰岩岩石试件进行了冲击实验。根据SHPB实验的实验技术及一维应力波理论,子弹的长度决定应力波的波长、子弹速度决定应力波的振幅。不同应力波波长或不同应力波振幅,对岩石损伤所产生的影响不同。应力波波幅值在67.2~102.7 MPa范围时,应力波幅值越大,试件受到的损伤越大;在应力波波幅相近情况下,波长较长的应力波会对试件造成较大的冲击损伤,且应力波波长与损伤成一定的指数函数关系。
Using the 50 mmSHPB experimental setup system of Hopkinson pressure bar laboratory at China University of Mining and Technology, impact experiments were performed on limestone samples. According to SHPB experimental technique and one-dimensional stress wave theory, the length of the bullet determines the wavelength of the stress wave, and the velocity of the bullet determines the amplitude of the stress wave. Different stress wave wavelengths or different stress wave amplitudes have different effects on rock damage. When the stress wave amplitude is in the range of 67.2 ~ 102.7 MPa, the larger the stress wave amplitude is, the greater the damage is to the specimen; in the case of similar stress wave amplitude, the longer wavelength stress wave will cause larger Impact damage, and stress wave wavelength and damage into a certain exponential function.