The quench sensitivity of 6063 alloy was investigated via constructing time-temperature-property（TTP） curves by interrupted quenching technique and transmission electron microscopy（TEM） analysis.The results show t...The quench sensitivity of 6063 alloy was investigated via constructing time-temperature-property（TTP） curves by interrupted quenching technique and transmission electron microscopy（TEM） analysis.The results show that the quench sensitivity of 6063 alloy is lower than that of 6061 or 6082 alloy,and the critical temperature ranges from 300 to 410℃ with the nose temperature of about 360℃.From TEM analysis,heterogeneous precipitate β-Mg2Si is prior to nucleate on the（AlxFeySiz） dispersoids in the critical temperature range,and grows up most rapidly at the nose temperature of 360℃.The heterogeneous precipitation leads to a low concentration of solute,which consequently reduces the amount of the strengthening phase β＇＇ after aging.In the large-scale industrial production of 6063 alloy,the cooling rate during quenching should be enhanced as high as possible in the quenching sensitive temperature range（410-300℃） to suppress the heterogeneous precipitation to get optimal mechanical properties,and it should be slowed down properly from the solution temperature to 410℃ and below 300℃ to reduce the residual stress.展开更多
An experimental study, in which six columns were loaded concentrically toinvestigate the behavior of reinforced normal strength and high strength circular columns underconcentric compression, is described. The concret...An experimental study, in which six columns were loaded concentrically toinvestigate the behavior of reinforced normal strength and high strength circular columns underconcentric compression, is described. The concrete strengths of the columns were 30 MPa and 60 MPa.The primary variables considered were the concrete strength and the amount of transversereinforcement. Test results indicate that smaller hoop spacing provides higher column capacity andgreater strength enhancement in a confined concrete core of columns. For the same lateralconfinement, high strength concrete columns develop lower strength enhancement than normal strengthconcrete columns. Both the strength enhancement ratio (f'_(cc) /f'_(co)) and the column capacityratio (P_(test)/P_o) were observed to show linear increase variations with rho_s f_(yt)/f'_c incircular columns.展开更多
For the static structural of ITER overall gravity support are analyzed by the ANSYS software of finite element method （FEM）. All the maximum stress intensity and maximum displacement of overall gravity support syste...For the static structural of ITER overall gravity support are analyzed by the ANSYS software of finite element method （FEM）. All the maximum stress intensity and maximum displacement of overall gravity support system are within the allowable stress limit and displacement limit.展开更多
＂奥卡姆的剃刀＂（Occam＇s razor或Ockham＇s razor）在科学界是一个广为人知、但也许并未得到广泛认可的原理。这一原理是由14世纪的逻辑学家、奥卡姆的威廉（William of Occam）首先提出的。奥卡姆位于英格兰的萨里郡,是威廉的出生...＂奥卡姆的剃刀＂（Occam＇s razor或Ockham＇s razor）在科学界是一个广为人知、但也许并未得到广泛认可的原理。这一原理是由14世纪的逻辑学家、奥卡姆的威廉（William of Occam）首先提出的。奥卡姆位于英格兰的萨里郡,是威廉的出生地。＂奥卡姆的剃刀＂原理通常表述为：＂如无必要,勿增实体＂（Entities must not be multiplied beyond necessity）,展开更多
文摘The quench sensitivity of 6063 alloy was investigated via constructing time-temperature-property（TTP） curves by interrupted quenching technique and transmission electron microscopy（TEM） analysis.The results show that the quench sensitivity of 6063 alloy is lower than that of 6061 or 6082 alloy,and the critical temperature ranges from 300 to 410℃ with the nose temperature of about 360℃.From TEM analysis,heterogeneous precipitate β-Mg2Si is prior to nucleate on the（AlxFeySiz） dispersoids in the critical temperature range,and grows up most rapidly at the nose temperature of 360℃.The heterogeneous precipitation leads to a low concentration of solute,which consequently reduces the amount of the strengthening phase β＇＇ after aging.In the large-scale industrial production of 6063 alloy,the cooling rate during quenching should be enhanced as high as possible in the quenching sensitive temperature range（410-300℃） to suppress the heterogeneous precipitation to get optimal mechanical properties,and it should be slowed down properly from the solution temperature to 410℃ and below 300℃ to reduce the residual stress.
文摘An experimental study, in which six columns were loaded concentrically toinvestigate the behavior of reinforced normal strength and high strength circular columns underconcentric compression, is described. The concrete strengths of the columns were 30 MPa and 60 MPa.The primary variables considered were the concrete strength and the amount of transversereinforcement. Test results indicate that smaller hoop spacing provides higher column capacity andgreater strength enhancement in a confined concrete core of columns. For the same lateralconfinement, high strength concrete columns develop lower strength enhancement than normal strengthconcrete columns. Both the strength enhancement ratio (f'_(cc) /f'_(co)) and the column capacityratio (P_(test)/P_o) were observed to show linear increase variations with rho_s f_(yt)/f'_c incircular columns.
文摘For the static structural of ITER overall gravity support are analyzed by the ANSYS software of finite element method （FEM）. All the maximum stress intensity and maximum displacement of overall gravity support system are within the allowable stress limit and displacement limit.
文摘＂奥卡姆的剃刀＂（Occam＇s razor或Ockham＇s razor）在科学界是一个广为人知、但也许并未得到广泛认可的原理。这一原理是由14世纪的逻辑学家、奥卡姆的威廉（William of Occam）首先提出的。奥卡姆位于英格兰的萨里郡,是威廉的出生地。＂奥卡姆的剃刀＂原理通常表述为：＂如无必要,勿增实体＂（Entities must not be multiplied beyond necessity）,
