[en] The forces on a rippled single layer coil are exactly calculated. The ripple shape is changed in a series of interations to arrive at constant tension zero bending shape. Analytical expressions and numerical methods are included

[en] Using a theory developed by Aggarwal and Oberbeck on tidal disruption of rigid bodies, an estimate is given for the internal cohesion of prominent sun-grazers. Considering the comet as a fluffy body, requirements are set on the tensile strength of the matrix material

No abstract available

[en] An investigation has been carried out of strength properties of single crystals of LuBa₂Cu₃O_7-x having submicrometre (74-245 nm) cross-sectional dimensions and oriented in the (100) direction. It has been established that the tensile strength of these crystals is independent of the cross-sectional dimensions, being equal to 4.3±0.7 GPa at 78 K. The maximum measured value of tensile strength has been found to be equal to 4.8 GPa. (author)

No abstract available

[en] In order to develop a simple method for calculating the crack width and the rigidity of partially prestressed and reinforced members, tests were carried out to measure the distribution of steel strain within the cracked region by milling out slots in the tensile bar and sticking the electrical gauges to the slots in series of chain type. Based on the test results, the trigonometric function is assumed to express the tensile strain distributions of steel bar and concrete between the adjacent cracked sections. According to the assumption, a series of simple formulas have been derived to predict the crack width and rigidity of partially prestressed and reinforced concrete members and verified in good agreement with test data. (orig./HP)

No abstract available

[en] This study was designed to predict work hardening exponent of materials from AFM (atomic force microscope) observations of residual indentation impression in sharp indentations. FE simulations of nano-indentation were performed to 140 combinations to each parameter (elastic modulus E, yield stress σ y , work hardening exponent n, and Poisson's ratio ν) expressing elastic-plastic behaviors of universal engineering metals. Using the results from FE simulations and dimensional analysis, dimensionless functions were established to correlate residual indentation profiles with the work hardening exponent. This function was examined with nano-indentation, tensile test, and AFM observations after indentation for two materials (Al6061-T6 and copper)

[en] A quest for obtaining the absolute metastable limit of liquids has been attempted by many researchers using various methods. The absolute limit obtained was the case having the maximum nucleation rate with one molecule critical cluster from a nucleation theory based on molecular interactions. In this study, the tensile strengths measured by various techniques were compared to the theoretical absolute metastable limit. The tensile strength of water, measured in microscopic inclusions, is close to the absolute metastable limit of 160 MPa while the tensile strength values measured by the centrifugal and acoustic methods is only about 15% of the absolute metastable limit. It has been found that the tensile strength values depend on the experimental conditions which determine the nucleation rate values. Problems related to predicting the absolute metastable limit by the classical bubble nucleation theory were also discussed

No abstract available