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For the laser welding of vehicle body, not only ensuring the mechanical properties of joints, but also paying attention to their appearance quality.
In the controlling aspect of the mechanical properties of laser welding joint, the research literature is more. 
At the time of the laser welding, the melting width of joint initial segment appears unstable phenomenon, affecting the performance of welding joint, especially affecting body appearance quality; at the same time galvanized layer near the joints will be destroyed inevitably, so the corrosion performance of workpieces will suffer a severe challenge; however, this research literature on this field is not much at present. 
Table 1 Chemical composition and mechanical properties of tested materials /MPa /Mpa (%) C Si Mn P S Others 800～950 500 10 0.18 0.5 2.0 0.025 0.015 ≥0.015 In order to reduce the weld defect, the welding spot is cleaned with the acetone before welding.
The main influencing factors of the surface tension contain the nature of the material and properties of adjacent phase, temperature and liquid composition. 

The mechanical properties, the friction coefficient and the wear performance were then studied.
Therefore in this work, the mechanical properties, the friction coefficient and the wear performance of the frictional materials for motorcycle clutch with fly ash replacements of some original substances were studied.
The mechanical and tribological properties were compared to the original product and the composition giving minimum cost with superior or similar properties to the original product was selected to produce the prototypes which were then tested on a dynamometer.
Specimens with fly ash were found to have higher hardness up to a certain amount of fly ash replacement beyond which a decrease in the mechanical properties was found.
These wear particles were found to be very crucial and are one of the main factors affecting the value of the coefficient of frictions of the system.

Low reciprocating load test and finite element analysis for three kinds of joints, Discussing the ultimate bearing capacity, hysteretic performance and fracture mechanic properties, Which the results shows that: the bearing capacity of improved joint has grater increased than the joint with endplate keep upright; when load to limit state, the flange plate of joint with endplate keep upright has strong fracture performance, this point has been proved during the experiments; According to the numerical distribution of cracks factor, can qualitative identify dangerous position of component, as a basis of fracture fortification for structure.
Portal frame light steel structure order already have this kind of node, but still haven’t clear design method, and waiting for the further research on the node’s mechanical performance.
(a)SP-1 (b)SP-2 (c) SP-2 (d) SP-3 Fig. 1 Joint detail drawing Test results and analysis Capacity and the end of the beam displacement analysis, Node in the repeated loads the load - strain curve is its ductility, energy dissipation capacity, strength, stiffness and other mechanical properties of a comprehensive reflection.
According to [5] conclusions of the study, RI cracking threshold value greater than 135 factors, the steel will be broken.
This shows that we can use the numerical simulation analysis to determine risk of breakage at the cross-section. (2): Calculation and analysis on cracking factors R1 under different loads, though with a certain discrete values, the general trend is the crack factor value increases with the load increases.

The need to use such structures is caused by a number of factors, with special attention drawn to operating conditions.
This change in the structure of the fusion zone leads to an abrupt change in properties in a very short section.
Valiulis, The structure and properties of 5%Cr-0.5%Mo steel welded joints after natural ageing and post-weld heat treatment.
Cui, Optimizing the mechanical properties in the repair zone of 5Cr5MoV by controlling welding heat input.
Parker, Microstructural features, mechanical properties and high temperature failures of ferritic to ferritic dissimilar welds.

Positive effect of the magnetic field on the properties and metal structure at welding many steels is known.
Studies have confirmed the effectiveness of using external electromagnetic impact (EEI) in underwater welding to improve the weld metal mechanical properties.
Such results will lead to a nonuniform level of metal mechanical properties, an increase in local internal stresses and, accordingly, to a decrease in crack resistance, respectively.
This leads to a 2 ... 3 times increase in dislocation hardening in local areas of the structure in places of extended dislocation accumulation and, accordingly, to a nonuniform level of mechanical properties and formation of local internal stresses raisers. 4.
Bernatskyi et al., Effect of the structure on the mechanical properties and cracking resistance of welded joints of low-alloyed high-strength steels, Procedia Structural Integrity. 16 (2019) 89-96

Trunk assembly is an important opening and closing part of the car body，its design must be considered rationality of the trunk’s rationality, convenience, comfort and other factors, so there are certain difficulties in the design.
c) Ensure the reliability and safety when locked and will not open automatically when driving ; d) The trunk should be switched on and off conviently; e) The trunk should have good sealing properties; f) The trunk should meet the requirements of horizon under the rear window; g)Trunk structure should have enough strength and stiffness which can ensure that suitcase is reliable; h) Good suitcase manufacturing, assembly process; i)The modeling should be consistent with the overlook of vehicles, including external surface shape, the license plate installation position, and the clearance between it and the parts at the side, and the position of the tail lights.
And it’s required that the distance between the operator and bumper is within 50mm~200mm. 3.1 Impact factors of trunk opening angle a).
Disadvantages: hinge occupied larger space when compared with four-link, affecting the storage space of the trunk.
Human Factors in Transport Research，1980，18：33-34

Introduction Mechanical interfaces are commonly used devices capable to model mechanical discontinuity conditions.
These localized phenomena change the behavior of the entire system and eventually affect the ultimate structural failure mode.
Features of the microstructure might play a relevant role when small scale problems are analyzed, since they affect the way in which localized damage forms, grows and propagates.
Nonlocal elastic-damage interface Let us consider an interface layer in which all the mechanical properties are projected over a surface of zero thickness.
However, in the most common cases, because damage induces elastic heterogeneous properties (and also because of different elastic stiffness in traction and compression states) the first local term is effective also far form the boundaries and gives an important contribution for spatial transition regions.

Introduction Gear drive is one of the fundamental forms in mechanical drive.
There are many factors which influence on gear driving quality.
Equipartition property of cutting tool in tool grinding and installation of hobbing cutter is poor.
Since influence factors are various, they are interrelated and interact on each other.
The radial quality of hobbing cutter both affects the tooth profile distortion and the error of tooth profile angle.

betog@fc.unesp.br Keywords: Superconductivity, mechanical spectroscopy, interstitial oxygen, superconducting oxides.
When oxygen is present interstitially, it strongly affects the physical properties of the material.
The oxygen content is a crucial factor to determinate the superconducting and other physical properties in Sm-123 high Tc superconductors.
A mechanical-loss peak was observed and associated to the interstitial oxygen mobility in the basal plane.
The mechanical spectroscopy measurements showed a relaxation peak whose intensity is directly proportional to excess oxygen content.

A novel feature of the code is its calibration which involves a choice of the constraint factors based on a physical foundation.
A previous work (e.g. [9]) has revealed that the in order to adequately account for the above factors three different constraint factors according to Eq. 1 should be incorporated into the SY model.
The measured mechanical properties of the material were the following: ultimate strength 540 MPa, yield stress 398 MPa, elongation to failure 25% and cyclic yield stress 340 MPa.
Selection of the constraint factors: (a) computed and observed hysteresis loop; (b) constraint factors’ dependency on the stress ratio [12].
Constraint model in the overload-affected zone [13].