Search results

Residual stress is an important factor in quality of the welding joints.
Residual stresses do not only affect the corrosion, cracking and fatigue strength in the mechanical properties of the welding joint, but also greatly affect physical mechanical characteristics of material, Therefore, the quantitative residual stress state obtained is very important for the welding structure designers, manufacturers and users.
Experimental test is authenticity, but can’t avoid the effects of human factors, environmental factors on the test results, the results of different measurements are different even using the same model.
That is to say, the correlation between the material properties and temperature should be taken into account.
The physical parameters at different temperatures are shown in Table 2[5] [6] Table 1 Chemical composition of A6N01S-T5 (wt%) Si Fe Cu Mn Cr Zn Ti V Mg 0.60 0.13 0.009 0.11 0.0021 0.03 0.034 0.010 0.64 Table 2 Material properties of A6N01-T5 Temperature（℃） 25 100 200 400 600 611 660 Thermal conductivity W/(m·K) 180.48 185.33 189.53 194.47 197.45 197.37 87.16 Heat capacity J/(kg·K) 0.9 0.94 0.99 1.07 1.21 2.21 1.17 Density（g/cm3） 2.7 2.68 2.66 2.62 2.57 2.57 2.39 Modulus（GPa） 67.54 64.65 60.79 25.4 7 5 1 Yield Strength（MPa） 210 185 110 30 12 5 5 Poisson's ratio 0.339 0.342 0.347 0.358 0.373 0.374 0.498 Heat source parameters.

Many factors influenced the release and degradation of the PLGA release systems.
These factors included polymer composition, molecular weight, the interaction of polymer and drugs, properties of drugs, plasticizer or additives [1,4,5].
Conclusion ASP could be effectively incorporated into PULG networks with shape-memory properties by swelling methods.
Okada, The effects of drug physico-chemical properties on release from copoly (lactic:glycolic acid) matrix, Int.
Lendlein, Biodegradable, amorphous copolyester-urethane networks having shape-memory properties, Angew.

The fresh-old concrete bonding interface is the key to designing assembled monolithic water-distributing beam of mechanical draft cooling tower.
Affected by the combined impact of shear force and moment, main rebar is under a state of complex stress, the principal stress of which can be calculated by the forth strength theory.
Introduction Mechanical draft cooling tower is the main structure of circulating cooling system in thermal power plant.
Force analysis of interface between fresh-old concrete Chinese scholars have conducted a lot of experimental study and theoretical analysis about the bonding properties and force mechanisms of the interface of fresh-old concrete, the main conclusions are [1~4]: 1) compared to monolithic pouring, the bonding strength of fresh-old concrete interface reduced to some extent, 2) on the interface, the shear transfer was achieved by fresh-old concrete bonding, dowel action, aggregate interlock and restraint stiffness of reinforcement.
The working environment determines the interface should be controlled under uncracked state. 2, because of the combined action of shear and bending moment, the reinforcing steel crossing interface is a complex stress state. 3, the anchorage is the prerequisite that ensures the function of reinforcing steel, so the reinforcing steel shall be prevented from anchoring failure. 4, when resistance of fresh-old concrete interface can be guaranteed, in order to ensure the durability, the surface of water-distributing beam should be coated waterproof paint. 5, there are many influence factors influencing strength of fresh-old concrete interface, and the experimental study on this project especially the influence of seepage is rare, further study is requested in the future.

The rate of the dendrite growth was affected by the concentration of the medium used.
In conjunction with this, the solder material used has become a dominant factor that will affect the reliability of a product.
Referring to [4], the overall properties which include mechanical properties and reliability of lead-free solders as Sn-Pb solder replacements is undoubtedly very promising.
Yet, the properties of these lead-free solder alloys in corrosive environments have not been widely reported even though it is an important issue in automotive, aerospace, maritime and defense applications.
Tanaka, Factors leading to ionic migration in lead-free solder, ESPEC TECHNOLOGY REPORT No 14. 2002 [10] D.Q.

Considered the weight differences in attribute sets, plus the weighting factor, we get the weighted Euclidean distance: ∑ ∑ = = − = n i i n i i b b i a a i ba n ixix xxd 1 2 1 22 ))](())(([ ),( λ λ µ µ (2) )(xµ is the membership function indicated the state of object properties.
So the attributes reflected cost should choose factors which are interrelated with manufacturing process and strongly affect cost as possible.
The above parameters can be used as association factor of estimation.
In such condition the level ratio factor must be taken into consideration to ensure the reliability of estimation results.
It provides a reliable foundation for estimating the affect that estimation samples exert on estimation results.

Furthermore this material maintains good mechanical properties across a wide range of temperatures from ultra-low temperatures up to temperature approaching 500 °C.
Therefore, the purpose of this study is to develop an optimal welding method for INCOLOY 825 and STS316L special materials for use at low temperatures by deducing and controlling the welding governing factors and to evaluate the product reliability.
To that end, the authors identified the mechanical properties of the weldment of a cryogenic film material and the weldment of a flange attached onto bellows by measuring the tensile strength and hardness.
Here, we execute butt welding on 0.8 mm-thick STS316L and INCOLOY 825 material using plasma heat source to determine the optimal welding parameters of bellows by evaluating the mechanical properties and formability of the materials2).
Conclusion In this study, the mechanical properties and micro-structure of a bellows joint and a flange joint were analyzed for use as an expansion joint for LNG carriers, which used STS316L and INCOLOY 825.

Orientation of fibre preforms is an important factor that affects the properties of short natural plant fibre composites.
Literature reports that dynamic sheet forming (DSF), used for paper production, has the potential to be used to form aligned fibre mats which could improve the mechanical performance of NPFCs [1-3].
Analysis of alignment in such fibre mats would be invaluable for estimating composite properties.
Le, A review of recent developments in natural fibre composites and their mechanical performance.
Efendy, Preparation and mechanical properties of novel bio-composite made of dynamically sheet formed discontinuous harakeke and hemp fibre mat reinforced PLA composites for structural applications.

The main required properties are then : creep, thermal fatigue, and oxidation resistance.
Some Properties of the Niobium Ferritic Steels.
Austenitic Stainless Steel for Structural Automotive Applications Required Mechanical Properties.
The above description of mechanical properties of austenitic stainless steels points out that various grades can be chosen to fit to the design requirements.
It allows to obtain a good compromise between high mechanical properties and a greater life time in severe conditions.

Factors for influencing the stability of steel slag The volume stability is one of the important characteristics to measure whether it is qualified or not while steel slag was used in building materials field as a kind of cementitious materials.
Mechanical modification Mechanical modification of steel slag is to make ultrafine steel slag under the strong mechanical force, increase the specific surface area of steel slag, making large amounts of free CaO and MgO exposed and hydrated fast.
Sun, The effect of grinding fine steel slag on the mechanical properties and stability of the admixture of cement and concrete, J.
Xu, The research of hydration properties of steel slag powder as auxiliary cementitious materials under the different water heat conditions, D.
Lian, et al, The property of iron tailings of high temperature used as modified steel slag, J.

However, with the present microfabrication techniques, process induced variations of geometrical features and of some material properties are inevitable and this is reflected in undesired variability of the device performance.
Among the causes of such variations there can be enumerated the process temperature variations that can induce surface stresses and affect the lithographic steps, non-uniform application of photo resist, non-uniform distribution of process gases, variation of the diffusion and concentration of the reactant in wet etching, chemical contamination of the wafers, imprecise mask alignment, material properties variations.
During this manufacturing step, due to the high temperatures involved, the material properties (such as Young's modulus) can be affected and present variations.
One simulation loop in a Monte Carlo simulation represents one manufactured device that has a particular set of geometric parameters and material properties.
The lengths of the parallel flexure beams (LBL and UBL) are the following most influential factors and they have a negative sensitivity, which means that an increase of the flexure beams' length would decrease the value of the natural frequency, hence it would reduce the stiffness of the structure.