Estimation Of Yield Strength Research Articles

箱形断面柱-H形断面はり接合部のダイアフラム補強に関する研究 : 接合部降伏耐力の評価

Analytical study has been carried out to estimate yield strengths of steel beam to box column connections. The obtained solution, which is based on the yield line theory, predicts accurately experimental behaviors and yield strengths for connections both with and without reinforcing diaphragm as follows : 1) For connection without diaphragm, Eq. (9) gives very close approximation to the experimental general yield strength which varies with type of corner weld of column as well as size of column and beam. 2) For connection reinforced with inner diaphragm, Eq. (21) is proposed. Estimated yield strength agrees well with the experimental strength dependent on several sets of parameters, especially, width to length ratio of diaphragm. It is also shown that the test results presented by K. Ban and K. Imai fairly conform to the formula. 3) For connection reinforced with outer diaphragm (or outside stiffening ring), calculated yield strengths by the formula of Eq. (23) are compared with experimental values offered by M. Tabuchi and K. Kanatani et al. As a result, good agreement is observed between the theory and the test results.

Estimates of rheologic properties for flows on the Martian volcano Ascraeus Mons

Morphological measurements on six well‐defined volcanic flows near the summit of the Martian volcano Ascraeus Mons were used to calculate the yield strength and viscosity of the lavas. The yield strength estimates range from 3.3×104 to 8.3×104 Pa (N m−2), with an average value of 2.1×104. These values are similar to yield strengths calculated for other flows on Martian and terrestrial shield volcanoes, but they are an order of magnitude less than the value for terrestrial andesite flows and two orders of magnitude greater than values for lunar flood basalts. Lengths of the Ascraeus Mons flows indicate lower limits on the effusion rate of 18–60 m3 s−1, with an average value of 35. Effusion rate and yield strength are used to calculate upper limits on the lava viscosity of 6.4×105 to 2.1×108 Pa‐s, with an average value of 2.3×107 (equivalent to 2.3×108 poise). Ridges on one flow indicate a viscosity lower limit of 1.1×108 Pa‐s for a ridge growth time of one hour. The estimated rheologic properties of the Ascraeus Mons flows are most consistent with basaltic or basaltic andesite lavas, but some individual flows may consist of more highly evolved lavas.

Correlation between strength and hardness of dental casting gold alloys

The yield strength, tensile strength, and hardness of Type IV dental casting gold alloys were measured. Regression lines and prediction intervals for the estimation of yield strength and tensile strength from hardness measurements were then determined. The 95% prediction intervals for the yield strength and tensile strength were found to be +/- 45 MN/m2 and +/- 105 MN/m2, respectively.