Search results

It was suggested that the large scattering of the indentation fracture toughness reported by the round-robin tests such as VAMAS was not originated from these factors.
Although the plausible excuse for the origins of scattering among several laboratories was considered as interobserver error in reading the crack length, there have been a few systematic studies about other experimental factors affecting the toughness[4].
Consequently, the calculated fracture toughness was not affected by the elapsed time.
In the model of Lawn et al, the strain in the plastic zone Table 1 Mechanical properties of the Si3N4 ceramics for ball bearings *The data was obtained by the SEPB method.
From these results, it is concluded that those factors was unlikely to be the cause of errors in the fracture toughness by IF technique.

At the same time, the sheets are affected by the thickness ratio, different properties, the weld-line movement among forming process parameters and often appear wrinkle, crack and rebound during the stamping process of the TWBs.
Therefore, the analysis of the part used in TWB forming properties has good representation.
There are some factors including wrinkle, crack and weld are the key to reduce forming property of TWBs.
L16 (45) orthogonal table can arrange five factors which the last two factors have not been arranged.
Evaluation of the mechanical properties of weld metal in tailored steel sheet by CO2 laser.

Welding sequence is one important factor which affects the residual stresses and distortions produced during welding, thus determines the welding quality and performance.
Material and Methods In this study, material used for the welding simulation was SAE 1020 with the material properties vary according to the temperature history [6, 10].
The material model of elasto-plastic based on the von Mises yield criterion and isotropic strain hardening rule was chosen, in which its response over the history was determined by the temperature-dependent material properties inputted.
It is clear that the peak temperature achieved was greatly affected by welding sequences.
[10] Metals Handbook Vol. 1, 10th ed., Properties and Selection: Irons, Steels, and High-Performance Alloys, ASM International, USA, (1990)

The size, thickness and the physical and mechanical properties of the top stratum are considered.
The physical and mechanical properties of the imperious layer are changed by the different contents.
Series 3 (five experiments) is designed to investigation the effects of physical and mechanical properties of soil at the weak zone.
Series 2.The physical and mechanical properties of the top stratum at the weak zone of Series 2 are the same as that of Series 1.
Series 3.Series 3 is designed to investigation how the physical and mechanical properties of the top stratum at the weak zone affect on the failure law.

Ultrasonic testing; Porosity; fluid-solid coupled; Experimental analysis Abstract: Due to the internal structure of red sandstone is loose, the influence factors of acoustic velocity are variety, it is necessary to make a quantitatively research on the influence factors.
Besides ultrasonic wave measurement, some scholars analyze the cracks development law of coal rock in other methods[4], in order to lay a soil basis for the further study of the physical and mechanical properties of the rock.
This section based on the ultrasonic wave velocity of rock in the water, oil before and after the coupling comparison to analyze the different liquid of holes affects the mechanical properties of red sandstone, and tries to analyze cause.
Experimental Research on Acoustic Wave Velocity of Coal Measures Rocks and Its Influencing Factors[J].
Testing study on seepage properties of broken sandstone[J].

Several I-shaped steel beams reinforced by CFRP are unloaded at different levels and the mechanical properties are analyzed and compared.
Many factors should be taken into consideration for structural reinforcement.
Therefore, steel properties of both elastic stage and are set.
Only elastic modulus and Poisson’s ratio are needed for elastic material properties, while plastic properties are reflected through the definition of the true stress and plastic strain of I-shaped steel beam (Fig. 2).
Plastic material properties of I-shaped steel beam are not included in table 1.

Diffusive layers thickness At one paper it was shown that control on steel surface properties (carburized layer thickness, mechanical properties) is possible by changing processing conditions and composition of an electrolyte [7].
Thus, the composition of the electrolyte and the processing temperature are the factors influencing formation of diffusive layers.
Mechanical properties Martensite layer is obtained after PEN/C with hardening.
Dependencies of the strength properties vs electrolyte composition were not found.
The composition of the electrolyte and the treatment temperature are the factors influencing formation of diffusive layers.

Tailoring of ceramic laminates to obtain optimal mechanical properties with enhanced fracture resistance is possible when predictions based on numerical calculations are employed.
Extraordinary mechanical properties were achieved via high internal stresses development during material processing.
Mechanical properties of such layered structures can be designed based on numerical predictions [6].
To achieve extraordinary mechanical properties high internal stresses developed during material processing especially due to CTE mismatch and phase transformation are used [7-10].
The addition of micro-fibres slightly modified the microstructural and mechanical properties.

The results of tests also showed that the mechanical properties decrease when used rubbers as aggregates.
The utilization of tires rubber negatively affected the hardened properties of SCC but improved ductility.
The decrease and increase in tensile strength of cylinders were caused by the same factors that influenced compressive strength.
Increasing the pores lead to decrease the mechanical properties of this sample.
ElGawady, Mechanical properties of high strength concrete with scrap tire rubber, Construction and Build.

Mechanical properties in the weld and base metal were therefore determined by performing a series of instrumented indentations across the weld at room temperature.
Mechanical properties of 15Ch2MFA (base metal) as well as 10ChMFT (weld) steels can present a gradient through the wall thickness, which can hardly be assessed by conventional testing such as tensile or Charpy tests.
Conclusions Local mechanical properties in form of the local stress-strain behavior were determined by so-called automated ball indentation technique in the weld, base metal and cladding of WWER 440 pressure vessel wall.
Although the ABI test is a macroscopic technique, it estimates the properties on a small volume of material (few grains), which is particularly useful in testing e.g. welds and irregularly shaped heat affected zones.
Oliva, Determination of the elastic-plastic properties of 15Kh2MFA steel with austenitic cladding.