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., Xuzhou 221400; 3China University of Mining and Technology, Xuzhou 221000) a89202974@qq.com Keywords: welding, numerical analysis, storage tank, stress Abstract: Welding is the main means of the connection of tank, is also an important factor in determining tank quality.
Welding stress and deformation under certain conditions may affect the function and appearance of weldments, and therefore are the issue that must consider in designing and manufacturing . 2.
Therefore, It is appropriate selection of model of welding heat source or not will affect the simulation accuracy of welding temperature field and deformation greatly, especially near welding heat source.
(1)Definition of elements and materials (2)Definition of unit Type: Select Brick 8node 45 Unit. 4.3.2 Definition of material properties: the elastic modulus EX = 2e5, Poisson's ratio PRXY = 0.3. 4.4 Create a model of the cylinder and pipe Ammonia storage tank is bilateral symmetry and sagittal symmetry, because only consider the stress of internal pressure, we can take advantage of the symmetry of the structure to model for 1/4 of the region of opening .
Chinese Journal of Mechanical Engineering, 2005, 41(9): 228-231.

They are very different conceptually as PIMD can only calculate static properties whereas CMD and RPMD are designed to calculate dynamic properties based on different concepts from each other [30].
Undoubtedly, this model does not consider many specific factors affecting the diffusion parameters of atoms in a metal, such as the interaction of impurity atoms, the presence of vacancies, influence of the Debye temperature, quantum tunneling at a cryogenic temperature, etc.
From Atomic-Level Interactions to Mechanical Properties, Springer, 2022
Wipf, Hydrogen in Metals III: properties and Applications (Topics in Applied Physics, 73), edited by H.
Völkl, Hydrogen in Metals I: Basic Properties: 1 (Topics in Applied Physics, 28), edited by G.

Error and accuracy of natural frequency are analyzed with modeling properties.
The properties are as following: The disk has a thickness of 90mm and a diameter of 450mm.
They are both made of steel with the material properties E=206GPa, G=79.4GPa, and ρ=7850kg/m3.
Influence Characteristics of Models of Shaft and Disk The mentioned model of rotor system is still used in this section as an example for convenient with same properties.
As a result, the natural frequencies are affected by various factors of modeling the system.

n Kεσ= (1) The material properties used in this study for steam generator tubes are listed in Table 1.
Material properties of Inconel 600 for plastic instability analysis ysσ (MPa) utσ (MPa) K (MPa) ν n 261.0 652.0 2901.68 0.3 0.36 Title of Publication (to be inserted by the publisher) In this study L is assumed to have the values of 25.4, 50.8 and 200 mm and the wear depth ratio (d/t) is assumed to range from 0.0 to 0.9.
Generally the burst pressure from the plastic instability analysis is very sensitive to the material properties.
The discrepancy between experimental data is probably due to the differences in test methods and mechanical properties caused by different heat treatment and so on.
However the burst pressure for the Model 2 is not much affected by the increase of wear length.

In this paper, the author from three aspects , the analysis of die casting process design principles, design principles and infiltration technology, makes a deeper understanding on the EPC process, and put forward some standards and requirements of the EPC process technology, which avoid the casting defects and waste caused by technical factors.
Compared with traditional sand casting method, they can greatly reduce the machining cost, and the mechanical processing 40% to 50%.
It directly affects the disappearance of application development technology casting.
Curing material has good solvent resistance and mechanical properties, and is close to the body at the same time.
The purpose of the second vacuum is to discharge tank infiltration gas liquid that prevents leaching liquid penetration into the casting defects in micro gas, and curing blowhole impact sealing property.

Their poor mechanical properties seriously affected their practical application [1].
Conversion rate used in experiments on the polymerization reaction products was analyzed as a target in order to identify the three factors, modified aerogels/styrene, alcohol-water ratio and PVP K-30, on the impact of styrene monomer conversion rate.
Fig. 3 TEM photos of different ultrasonic time (a-0min, b-10min, c-20min) As shown in Fig. 3(a), by only mechanical mixing its polymerization produces compound microballoons, where the monodispersity of the microballoons was poor, the severe superimposition appeared and the single granule can not be identified.

Fyhrie and Cater defined the strain energy density instead of equivalent stress as mechanical stimulus.
The operation of the other models is more complex, the injury is great, these can affect the growth and metabolization of animal at different degree, besides of this, the animal is difficult to be feed after operation, therefore the experiment error will increase.
But the factor K increased distinctly within 0- 5 weeks, at the 5-10 weeks, its increasing speed begins to decrease.
Effect of Stress Environment on Bone Growing, Bone Remodeling and Mechanical Properties of Rapid Growing Rats’ Femurs[J].Chinese journal of biomedical engineering.Vol.2(2006),p.79-83 [9] Danielsen CC.
Cortical bone mass, composition, and mechanical properties in female rats in relation to age, long-term ovariectomy, and estrogen substitution.

Physical degradation is caused by mechanical impacts that change material properties (humidity, temperature, etc.).
The moisture degradation factor based on low velocity of air flow and temperature is not mostly apparent within short time.
It is possible to design ductile, flexible, breathable, permeable and transparent properties of nanofibers.
The resulting material has excellent bactericidal properties [3].
Properties of this layer can be modified in accordance with the results of computational model.

In particular, PLA has good transparency, and some of its mechanical properties (such as Young’s modulus) are similar or even better than those of the most used polymers in packaging industries (polyolefins, PET, PS).
Finally, improved mechanical and gas barrier properties were obtained by Boufarguine et al. [13] on PLA/PHBV (90/10 wt%) films fabricated using a custom multilayer co-extrusion process.
Blending polylactic acid with polyhydroxybutyrate: The effect on thermal, mechanical, and biodegradation properties, Advances in Polymer Technology 2011, 30, (2), 67-79
PLA-PHA Blends: Morphology, Thermal and Mechanical Properties, European Polymer Journal 2012, 48, 1110-1117
PLA/PHBV Films with Improved Mechanical and Gas Barrier Properties, Macromolecular Materials and Engineering 2012

Introduction Electrical equipments are easy to be influenced by human factors, equipment factors and environmental factors in the process of operation, if human operate them incorrectly, misope- ration can make the equipments unable to run normally, or even cause safety accidents, threat directly to the people life and property safety.[1-2]Therefore, the enterprise must pay attention to the electrical faults, and take some feasible measures, timely deal with electrical faults, reduce potential risk.Electrical faults are differences owing to the different type or model of loom, common electrical faults and positions are shown in Table 1.
The higher frequency of irregular broken weft certainly belongs to the mechanical problems, the poor weft transmission can be caused by weft tube, guide hole or all parts in contact with weft.
In electrical ways, in the process of a complete weft insertion, the existence of the weft is detected by the weft sensor, when driving in the sensor probe holes, weak mechanical vibration generated by sliding, sent “with weft”signal ensure machine running through the machine - electric conversion and amplification.
Loom starting circuit with several buttons, parallel connection, contact for normally open contacts, if one cannot conduct, this is not enough to affect all button, they can be transposed to check, but the stop button is a normally closed contacts in series, loom can't run if there is a fault.
The brake clearance is too large or brake weakness all can cause the parking does not reach the designated position; Brake weakness can be casued by mechanical faults, aslo may be due to electrical fault.