The mechanical properties of limestone such as the stress-strain curve, the variable characteristics of peak strength and the modulus of elasticity of limestone were studied under the action of temperatures ranging fr...The mechanical properties of limestone such as the stress-strain curve, the variable characteristics of peak strength and the modulus of elasticity of limestone were studied under the action of temperatures ranging from room temperature to 800 °C.Our results show that:1) the temperature has not clear effect on the mechanical properties of limestone from room temperature to 600 °C.However, the mechanical properties of limestone deteriorate rapidly when the temperature is above 600 °C.In this case, the peak stress and modulus of elasticity decrease rapidly.When the temperature reaches 800 °C, the entire process, showing the stress-strain curve is displayed indicating an obvious state of plastic-deformation;2) the failure mode of limestone shows the breakdown of tensile strength from room temperature to 600 °C, as well as the compress shearing damage over 600 °C;3) combining our test results with the concept of thermal damage, a thermal damage equation was derived.展开更多
In a strong magnetic field,the magnetic susceptibility χ and equivalent magnetic susceptibility λχ of some paramagnetic materials depend sensitively on the applied field He.Here λ is the coefficient of the effecti...In a strong magnetic field,the magnetic susceptibility χ and equivalent magnetic susceptibility λχ of some paramagnetic materials depend sensitively on the applied field He.Here λ is the coefficient of the effective field Hm,which relates to the superexchange interaction between the electrons in different magnetic ions.We present the forms of the adiabatic equivalent λχ and the effective field Hm.The adiabatic magneto-caloric and magnetooptical effects of paramagnetic terbium gallate garnet Tb_(3)Ga_(5)O_(12) are calculated at 6 K in strong magnetic fields.Our calculated results are in agreement with the experimental data.展开更多
基金Projects 50490273 supported by the National Natural Science Foundation of China2007CB209400 by the National Basic Research Program of China+1 种基金08KJD130003 by the Basic Research Program of University in Jiangsu ProvinceXKY2007219 by Xuzhou Institute of Technology
文摘The mechanical properties of limestone such as the stress-strain curve, the variable characteristics of peak strength and the modulus of elasticity of limestone were studied under the action of temperatures ranging from room temperature to 800 °C.Our results show that:1) the temperature has not clear effect on the mechanical properties of limestone from room temperature to 600 °C.However, the mechanical properties of limestone deteriorate rapidly when the temperature is above 600 °C.In this case, the peak stress and modulus of elasticity decrease rapidly.When the temperature reaches 800 °C, the entire process, showing the stress-strain curve is displayed indicating an obvious state of plastic-deformation;2) the failure mode of limestone shows the breakdown of tensile strength from room temperature to 600 °C, as well as the compress shearing damage over 600 °C;3) combining our test results with the concept of thermal damage, a thermal damage equation was derived.
基金Supported by the Fundamental Research Funds for the Central Universities(No 2010LKWL07)the National Natural Science Foundation of China under Grant No 51074155.
文摘In a strong magnetic field,the magnetic susceptibility χ and equivalent magnetic susceptibility λχ of some paramagnetic materials depend sensitively on the applied field He.Here λ is the coefficient of the effective field Hm,which relates to the superexchange interaction between the electrons in different magnetic ions.We present the forms of the adiabatic equivalent λχ and the effective field Hm.The adiabatic magneto-caloric and magnetooptical effects of paramagnetic terbium gallate garnet Tb_(3)Ga_(5)O_(12) are calculated at 6 K in strong magnetic fields.Our calculated results are in agreement with the experimental data.
