Proportional limit stress （PLS） and residual thermal stresses （RTS） of 3D SiC/SiC composite were investigated. PLS was obtained by four different methods from the monotonic stress-strain response curve to get a co...Proportional limit stress （PLS） and residual thermal stresses （RTS） of 3D SiC/SiC composite were investigated. PLS was obtained by four different methods from the monotonic stress-strain response curve to get a convincing value. RTS in the SiC matrix was quantified by solving the geometric intersection point of the regression lines of hysteresis loops from the periodical loading-unloading-reloading cycle test curve. Classical ACK model and analytical formulas were used to analytically calculate the PLS and RTS of 3D SiC/ SiC composite. Good agreement between the experimental results and the analytical calculation was observed. And relationship between the PLS and the RTS of 3D SiC/SiC was discussed.展开更多
The target parameters of modern ultra-low emittance storage ring light sources are entering into a regime where intra-beam scattering（IBS） becomes important and, in the case of the Beijing Advanced Photon Source（B...The target parameters of modern ultra-low emittance storage ring light sources are entering into a regime where intra-beam scattering（IBS） becomes important and, in the case of the Beijing Advanced Photon Source（BAPS）, which is being designed at the Institute of High Energy Physics（IHEP）, even a limitation for achieving the desired emittances in both transverse planes at the diffraction limit for X-ray wavelengths（≈10 pm）.Due to the low emittance, the IBS effect will be very strong. Accurate calculations are needed to check if the design goal（εh＋εv =20 pm） can be reached. In this paper, we present the results of numerical simulation studies of the IBS effect on a BAPS temporary design lattice.展开更多
基金supported by the National Natural Science Foundation of China(Nos.50972119 and 50902112)the Centre for Foreign Talents Introduction and Academic Exchange for Advanced Materials and Forming Technology Discipline Northwest Polytechnical University,Xi'an,China,the 111 Project(B08040)
文摘Proportional limit stress （PLS） and residual thermal stresses （RTS） of 3D SiC/SiC composite were investigated. PLS was obtained by four different methods from the monotonic stress-strain response curve to get a convincing value. RTS in the SiC matrix was quantified by solving the geometric intersection point of the regression lines of hysteresis loops from the periodical loading-unloading-reloading cycle test curve. Classical ACK model and analytical formulas were used to analytically calculate the PLS and RTS of 3D SiC/ SiC composite. Good agreement between the experimental results and the analytical calculation was observed. And relationship between the PLS and the RTS of 3D SiC/SiC was discussed.
文摘The target parameters of modern ultra-low emittance storage ring light sources are entering into a regime where intra-beam scattering（IBS） becomes important and, in the case of the Beijing Advanced Photon Source（BAPS）, which is being designed at the Institute of High Energy Physics（IHEP）, even a limitation for achieving the desired emittances in both transverse planes at the diffraction limit for X-ray wavelengths（≈10 pm）.Due to the low emittance, the IBS effect will be very strong. Accurate calculations are needed to check if the design goal（εh＋εv =20 pm） can be reached. In this paper, we present the results of numerical simulation studies of the IBS effect on a BAPS temporary design lattice.
