Papers by Keyword: m Value

Abstract: The determining of m value in “m” method has great significance to force analysis of pile foundation buried segments. In this paper, a finite element software is used for the nonlinear finite element analysis of elastic long pile under the horizontal force action, and combined with the related provisions and formulas for “m” method given in 《Code for Pile Foundation of Harbour Engineering》, a accurate m value can be obtained conveniently. Then based on this method and by the single factor analysis, a more systematic study was made to the related factors, and obtained the influence law of various factors to m value.

Abstract: As m value is not an inherent property of soil and affected by many factors, limited to the current level of theorey and technology, m value of soil around each pile can not be accurately taken when using “m” method to simulate the pile-soil interaction in engineering. In this paper, finite element software is used for the systematic study on the influence of m value to internal force and deformation for transverse bent of high-piled wharf. By analysis, it is considered that the influence is little and can meet the project accuracy requirements when taking m value through experience.

Abstract: In recent years the rock-socketed continuous concrete walls have been applied in supporting structure of foundation excavation, and the main problem of which is how to simulate m value of wall bottom bedrock. In this paper, the m value of rock-socketed underground continuous concrete wall bedrock is monitored by a structural test about a typical engineering. The monitored data of foundation excavation supporting deformation are fitted by least-square method, and the bedrock m value of which are researched and analyzed based on an optimization method and fitting deformation curves. The test shows the monitored m value meets the corresponding engineering regulations and is related with the broken degree of rock on the monitored position, and the variability of which is lesser in the construction process.

Abstract: Magnesium alloys show promise in meeting the demand for materials of lighter weight and higher rigidity. Mg alloys are hard to process and normally require grain refining for improved formability and mechanical properties. To process these fine-grained Mg alloys effectively, it is important to relate their load stress and mechanical properties to changes in their microstructures. Using a biaxial tensile machine and cruciform specimens, to evaluate the mechanical properties, microstructure, and plasticity, in a high temperature biaxial stress state, used of AZ31 Mg alloy sheet. With biaxial deformation, grain boundary slide occurred more frequently than with uniaxial deformation, causing grain boundary separation and formation of micro-voids between the grains. In the vicinity of the cracks and at the locations of grain boundary separation, although deformation temperature at higher than the recrystallization temperature, fine grains (about 2 )m) showing in duplex grain structures were formed locally. The formation of duplex grain structures as a result of local formation of fine grains during the deformation process is a major issue to be solved from the viewpoint of plasticity processing.

Abstract: Over the last 40 years there have been many papers published showing superplastic properties of metallic materials. However there has been no standardized test available to assess and compare material, and researchers and companies in the field have devised a number of different methods to show superplastic properties. The value of these properties can vary dependent on the test method used. ASTM International (formerly The American Society for Testing and Materials ) has developed a standardized test method for superplastic properties. The standard is intended for all to use as a common platform for testing, evaluating and publishing superplastic properties to a uniform format, useful for both academia and industry. The paper outlines the main points of the standard, including:- The coupon geometry and the method of clamping the coupon in the grips. The furnace and test machine requirements. The testing conditions and the method of pulling the coupon. The analysis of the load and extension data from the test, and the standard presentation of superplastic properties. The basic superplastic properties of stress versus strain for any particular constant strain rate. The method to determine ‘m’, using a step method at a particular strain. Some data is presented showing how the properties of fine grain Ti-6Al-4V titanium alloy are derived and presented using the standard.