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The domestic waste decomposing microbial inoculants WU-1 was prepared in our lab and its acute oral toxicity and Ames-mutagenicity were determined. Thes results showed that The acute oral LD50 of the domestic waste decomposing microbial inoculants WU-1 was estimated to be greater than 5000 mg/kg by using of Sprague Dawley (SD) rats. The domestic waste decomposing microbial inoculants WU-1 did not...
The springback is mainly an elastic deformation which occurs after sheet metal forming processes. This paper analyzed the mechanism of deep drawing springback of sheet metal forming, and the springback compensation was studied. Based on this, taking the stiffener parts of auto as an example, the paper analyzed the trend and distribution of springback and its distribution under different conditions...
Germination of platanus acerifolia's winter buds and cones falling bring great inconvenience to people's lives, therefore, how to reduce it becomes an issue of concern. Now studies on platanus acerifolia are mostly from phenotypic variation and follow-up observations which had difficulty in guaranteeing long-term stability, but less at the molecular level. This experiment use young leaves of fine...
The numerical simulation on welding process of simple structure in the paper, there are many problems have been handed. for example moving heat, latent heat of phase change and characteristic parameters of materials reduce nonlinear analysis and improve the efficiency by indirect method to calculate constructive field. ANSYS software was applied to analyze temperature field and stress field of welding...
In order to realize a less invasive robotic neurosurgery for the deeply seated tumor, a force detecting gripper with a flexible micro manipulator has been developed. Gripping force applied on the gripper is detected by strain gages fit on the gripper clip. Signal is conducted to the amplifier by the cables through the inner pipe of the manipulator. In order to approach to the deeply seated tumor through...
In order to match high power density and large counts of I/Os with the need for smaller-sized automotive electronic devices and low cost, new solutions have to be developed without any concessions to reliability. The authors describe the so-called i2Board concept, developed by Schweizer Electronic AG and used in the VISA project, funded by the German Government. VISA is an abbreviation and means "fully...
Atomic diffusion in soldering process leads to growth and stress developed in the intermetallic compound layer in solder joints. The stress and morphological evolution of the intermetallic compound layer, which is driven by the stress, result in degradation of mechanical performance of solder joints. Microstructure of the intermetallic compound layer in solder joints is modeled. The model consists...
The rate-dependent Johnson-Cook material model can predict the stresses and strains of lead-free solder when the strain rate is relatively low (600 s−1). At higher strain rates (1200 s−1 or above), the stress-strain curves predicted by Johnson-Cook model do not agree well with the experimental results when the strain exceeds a threshold value. In this paper, the damage effect is considered into the...
This paper discusses the influences of various underfills and adhesives on board-level bend performance of ChipArray® Thin Core Ball Grid Array (CTBGA) assemblies through an the monotonic three-point bending test. It is found that the bonding materials do enhance the bend performance for all the test categories as compared with the control assemblies which are without bonding materials, but the degrees...
With the development of integrated circuit to miniaturization, the diameter of the solder joints becomes smaller and smaller and the microvias in the high density PCB also become more and more. The design of the microvia has impacted on the fatigue life of the solder joints. This paper establishes the 3D Finite Element Method symmetric models of WLCSP through studying the influence of the parameters...
For the series of U-channel section, which has similar structure, it is easy to adjust the geometric model of U-channel section by using parametric design method, the efficiency is improved and the time for product design will be shortened greatly. By using the ANSYS Parametric Design Language (APDL), the FEA process including creating FEA model and analysis steps is discussed with the finite element...
The pyrolysis oil from lignocellulosic biomass as a renewable resource has been exploited and utilized. Microbial degradation of the pyrolysis oil by several fungi strains was investigated. The results showed that Trichoderma viride, Aspergillus niger, Trichoderma harzianum, Penicillium oxalium and Phanerochaete chrysosporium could grow well using the pyrolysis oil as carbon source, while the growth...
For a solution of repair welding, the welding process of the entire multi-layer multi-channel is simulated and analyzed. The results show that has the big welding residual stress and distortion nearby welding joint as a whole, the residual stress is bigger away from the welding joint nearer, and the residual stress existence's high-risk spot is revealed. It provides a theoretical basis for the enterprise...
Considering the influence of compression stress, a critical criterion of adiabatic shear in orthogonal high speed cutting is given by linear perturbation on the compress-shear deformation continuum mechanics basic equations of the primary shear zone. Combining with the relationship of cutting conditions and deformation ones, also the materials constitutive relationship, a prediction model, which expressed...
The tangential constitutive matrix is derived in the paper for the nonlinear finite element computation of rubber material as the strain energy function is expressed by Mooney-Rivlin model. The stress and strain of constitutive relation are separately expressed by Piola-Kirchhoff stress and Green strain with Lagrange description. As the incompressibility considered, the strain energy function is decoupled...
Fatigue is an important failure mode for swing frame of mine trunk. However, swing frame have so many attributes that it is difficult to analyze their fatigue damage using experimental measurement methods. In this paper the stress and strain analysis of swing frame is obtained by MSC. Patran software with the help of the dynamic analysis from MSC. Adams software. Improved model of swing frame is made...
The solid solution between bismuth ferrite and lead titanate, is a perovskite structure either tetragonally or rhombohedrally distorted lattice. It exhibits antiferromagnetic and ferroelectric properties at room temperature. xBiFeO3-(1−x)PbTiO3 or BFPT possesses a morphotropic phase boundary (MPB) between the rhombohedral and tetragonal forms around x=0.7, accompany with a spontaneous strain of 18%...
The unloading injury and constitutive equation of unloading rock mass isn't linear. Therefore, the similar design method of unloading rock mass can't be designed according to the linear elastic constitutive model. So the dimensional analysis is adopted. The result shows that there are only two basic similar scales if the complete geometric similarity is used. All other similar scales can be deduced...
Based on the elastic-plastic properties of moulded pulp material, the strain fields and stress fields of a large-scaled moulded pulp pallet under compressive load are analyzed by using of finite element software ABAQUS. Results indicate that the elastoplasticity must be considered for accurately forecasting the mechanical respond of large-scaled moulded pulp pallet. Furthermore, the maximal loading...
Natural soft clays in geotechnical engineering always show some structured behaviors, which are characterized by the softening stress-strain relationship. However, the Modified Camclay model, which is built on the basis of remolded soils, cannot capture such kind of structured characteristics. Two parameters of the Modified Camclay model are modified due to the difference between the slopes of the...
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