Search results

The seismic performance of reinforced concrete(RC) columns is one of the controlling factors of the shock resistance for RC frame structures and bridges under seismic loads.
Due to the complicated material behavior and complex external force during the earthquake, an accurate simulation of the mechanical performance under seismic loads demands more precisions for the hysteresis constitutive laws of materials.
Introduction Reinforced concrete (RC) columns, which are the important supporting member of bridges and reinforced concrete frame structures, will be repeatedly affected under the horizontal seismic forces of earthquake excitation.
In severe cases,the structure could lose its functions, or even collapse,and cause heavy losses of lives and property.

Its properties upon conventional processing were first studied and published in 2011 by Omori et al. [15].
Residual stress as a result of high thermal gradients, is expected to be one of the key factors.
Moreover, the functional properties of the two SMAs will be studied in depth.
Wiley, „Effect of Low‐Temperature Phase Changes on the Mechanical Properties of Alloys near Composition TiNi“, Journal of Applied Physics, Jg. 34, Nr. 5, S. 1475–1477, 1963
Chauvet et al., „Hot cracking mechanism affecting a non-weldable Ni-based superalloy produced by selective electron Beam Melting“, Acta Materialia, Jg. 142, S. 82–94, 2018

These all factors suggested the potential of its utilization as an alternative supplementary cementing material in concrete [2].
These aspects positively affects the properties of concrete [12].
The composition and usual mechanical properties of HPC mixture.
Kim, “Studies on mechanical properties of concrete containing waste glass aggregate,” Cem.
Broukalová, “Mechanical Properties of Cement Composites with Alternative Binders,” Adv.

It is unclear how the presence of these contaminants directly affects the properties of Ti, but there is ample circumstantial evidence that suggests that by-products of these contaminants can cause porosity during consolidation.
Small volume fractions (<1-2%) of microscopic (less than a few mm in diameter) pores do not seem to affect tensile properties of Ti alloys because they are quite ductile, but these same pores can act as fatigue crack initiation sites during cyclic loading.
The basic mechanical properties of the materials consolidated by several of the methods mentioned earlier are acceptable, albeit typically higher in strength with somewhat lower, but acceptable ductility.
Some of these factors are related to market size and cost, but these factors are every bit as important to the acceptance of new production methods as the technology itself.
Clearly this situation will be more readily achieved for static than for dynamic properties.

Introduction Tolerance & fit directly affects the product manufacturing and cost, which controls the dimensional accuracy of mechanical parts, ensures the production enterprise collaboration, product quality and parts exchange.
When designers use AutoCAD for mechanical design, they have to find information from mechanical design manual or to determine on their experiences because each version of AutoCAD can not seek tolerance, and tolerances are different for different sizes and tolerance grades, and have many labeling forms.
Basic dimensions can be input by a text box, or by the AcadEntity annotation object properties measurement to return the size of the measured value, tolerance grades and basic deviations are selected with the list box.
The property values are "acTolNone" (no tolerance), "acTolSymmetrical" (symmetric tolerance), "acTolDeviation" (limit deviation), "acTolLimits" (limit size), "acTolBasic" (basic size).
"ToleranceHeightScale" gets or sets the scale factor of the height of the text for the tolerance values relative to the object's general text height.

Results and findings published recently indicate that upon treatment with this technology, the fatigue resistance of the material can either decline or increase, even considerably, depending on numerous base material characteristics, laser hardening parameters and other factors.
At such values, metastable microstructures with novel properties are obtained.
A question remains: what are the fatigue properties of a laser-hardened surface in comparison with, for instance, bulk or induction hardening?
The hardening set-up used for the K3 specimen, i.e. the lower velocity variant, did not improve fatigue properties and led, in part, to their deterioration.
Upon the procedure which led to enhanced fatigue properties, more notable compressive stresses were found in the direction of the main fatigue load.

Lightweight, robust, and anti-rust properties of aluminium foam might be a solution for reducing the effect of traffic accidents and for minimum fuel consumption.
The most common material used in the production of crash boxes is aluminum which has the properties of being lightweight, corrosion resistant, and having high ductility value [3].
Hussain also investigated the energy absorption properties of glass fiber reinforced plastics foam filled [9].
METHODS Peak collision force (Fmax), specific energy absorption (SEA), and collision force efficiency are all factors for crashworthiness.
This data will be used as material properties in Abaqus so that the results to be obtained are close to the real value.

Also, the mechanical properties of the bilayer coating showed higher adhesion strength than HAp and F-HAp coatings on 316L SS.
PCL is a semi-crystalline aliphatic polymer with good biocompatibility and amazing mechanical properties [10, 11].
The relationship between the mechanical properties and cell behaviour on PLGA and PCL scaffolds for bladder tissue engineering.
Part II: mechanical properties of solid solutions determined by microindentation.
The effect of fluorine content on the mechanical properties of poly (ɛ-caprolactone)/nano-Fluoridated hydroxyapatite scaffold for bone-tissue engineering.

In recent years, studies focused on the role of vanadium in steels and affection on microstructure and mechanical properties [2-5].
Practices found vanadium content in rebar was unstable and in the range of 0.001-0.014% which leaded to fluctuate more than 40 MPa in the mechanical properties with the traditional double process.
The average manganese content decreased 0.25% and the average vanadium content increased 0.016% under the similar mechanical properties (Rel/R0=1.15, Rm/Rel=1.33).
Table 4 shows properties of HRB400E by V-iron alloying and its properties meet HRB400E requirements, the average yield strength of vanadium ball alloying was 447 MPa slightly lower than that of traditional FeV alloying which was 458MPa.
Affect factors on performance decreased were large number of impurity elements in vanadium-containing molten iron.

Study on Load-velocity Dynamic Property of Piston-type Hydraulic Cylinder based on SIMULINK JIN Xiangshu1, a, DING Shiyan1, b, TANG Xuezhong 2 and HU Zhixi2 1 School of Mechanical and Electronical Engineering, Changzhou Institute of Technology, Changzhou, Jiangsu 213002, China 2 School of Information Technology, Changzhou Institute of Technology, Changzhou, Jiangsu, 213002 China a zhongshanfyking@126.com, bjinxs@czu.cn Keywords: SIMULINK; Hydraulic cylinder; Dynamic property; Modeling; Simulation Abstract.
Founded the simulation model in the SIMULINK/ MATLAB environment and solved its unit-step response based on the relation between load and velocity, gave the hydraulic cylinder design parameter and the medium character's influence to its unit-step response, summarized the intrinsic relations between parameters and the time domain index, provided the theory basis to optimize the hydraulic cylinder dynamic property.
A1 A1 BmS + 1 ( )SF ( )SP1 − ( )SV S V hc β λ + 1 − Fig. 2 System block diagram when ( ) 0Q S = Obviously it is a second-order system, which consists of two main parameters, non-damped natural frequency: ( )21 c n h A B mV λ β ω + = rad/s (4) Damping ratio: 2 1 1 2 ( ) h c h c h BV m mV A B mV λβ ξ λ β + = × + 2 12 ( ) n h c c BV m A B ω λβ λ β + = × + (5) The following major factors which affect dynamic performance of hydraulic cylinder can be concluded according to equation (4) and (5).
Guo: Chinese Mechanical Engineering Vol.14 (2003)No.10, p.823-825