A Constant Tensile Stress Creep Testing Machine

1976 ◽  
Vol 4 (1) ◽  
pp. 26 ◽  
Author(s):  
RL Meltzer ◽  
YR Fiorini ◽  
RT Horstman ◽  
IC Moore ◽  
AL Batik ◽  
...  
Keyword(s):  
Tensile Stress ◽  
Testing Machine ◽  
Creep Testing

FEM Analysis of Failure Process in Thin Film during Wear Test

2010 ◽  
Vol 154-155 ◽  
pp. 1689-1694
Author(s):  
Jin Hua Zheng ◽  
Ying Chen ◽  
Chun Lei Lin ◽  
Xin Li Wei
Keyword(s):  
Tensile Stress ◽  
Failure Process ◽  
Testing Machine ◽  
Film Surface ◽  
Wear Test ◽  
Fem Analysis ◽  
Maximum Tensile Stress ◽  
Maximum Principal Stress ◽  
Parallel Cracks ◽  
Before And After

The semi-circular parallel cracks appeared on the film surface with the angles of 45 degree to the sliding direction of SiC ball and the delamination of film quickly occurred after cracking by using a “ball-on-disk” type testing machine. Stress distribution before and after cracking in the film was calculated by FEM analysis. The maximum tensile stress existing in the film at the back-contact edge of ball is the reason for the initiation of semi-circular parallel cracks. The tensile stress normal to interface as well as the shear stress along interface appears at crack tip, and the alternate generation of these two stresses is the main reason for the delamination. The longitudinal normal stress σxx and the maximum principal stress σ1 become bigger after cracking, so that the crack propagation is faster.

A constant stress creep testing machine

1983 ◽  
Vol 16 (2) ◽  
pp. 153-156 ◽  
Author(s):  
Steven Vogel ◽  
Michael N. Papanicolaou
Keyword(s):  
Testing Machine ◽  
Constant Stress ◽  
Creep Testing

Dynamic Tensile Characteristics of Nuclear-Grade Graphite IG-11

2014 ◽  
Vol 566 ◽  
pp. 61-66
Author(s):  
Takashi Yokoyama ◽  
Kenji Nakai
Keyword(s):  
Tensile Stress ◽  
Strain Rate ◽  
Fracture Strain ◽  
Testing Machine ◽  
Nuclear Grade ◽  
Dynamic Tests ◽  
Stress Strain ◽  
Fine Grained ◽  
Split Hopkinson ◽  
Static And Dynamic Tests

The effect of strain rate up to nearly = 102/s on the tensile stress-strain properties of isotropic fine-grained nuclear-grade graphite IG-11 was investigated. Cylindrical tensile specimens machined out of graphite bars were used in both static and dynamic tests. The dynamic tensile stress-strain curves up to fracture were determined using the split Hopkinson bar (SHB). The low and intermediate strain-rate tensile stress-strain relations up to fracture were measured on an Instron 5500R testing machine. It was demonstrated that the ultimate tensile strength increases slightly, while the fracture strain and absorbed energy up to fracture decrease dramatically with increasing strain rate. Macro and microscopic examinations revealed a slight difference in the fracture surfaces between the static and dynamic tension specimens.

scholarly journals Properties of Oil Shale Ash Filled Polypropylene Composite Material: Mechanical and Physical Characterization

2021 ◽  
Vol 33 (9) ◽  
pp. 2175-2181
Author(s):  
Alaa Al-Shurafat ◽  
Raid Banat
Keyword(s):  
Tensile Stress ◽  
Polymer Composite ◽  
Water Uptake ◽  
Oil Shale ◽  
Tensile Strain ◽  
Testing Machine ◽  
Impact Testing ◽  
Scanning Calorimetry ◽  
Oil Shale Ash ◽  
Shale Ash

The outcome of oil shale ash (OSA) filler addition on the mechanical, morphological, thermal and water uptake properties of the polypropylene (PP) matrix was investigated. The test specimens were prepared with various ratios of the mixtures that contain OSA and polypropylene in the following weight percentages: 0%, 10%, 20%, 30% and 40% OSA in polymer matrix. Composites specimens were produced by using a co-rotating twin screw extruder and a thermal press machine. The properties of the polymer composite specimens were characterized by using a universal testing machine (WDW-5) and izod impact testing machine (FI-68). The morphology of the composite samples was also characterized by using the scanning electron microscopy (SEM). Impact strength and Young’s modulus of the OSA/PP composite formulations were consistently improved on OSA inclusion. On the other hand, addition of OSA to pure polypropylene had consistently reduced the tensile stress at yield, tensile stress at rupture, tensile strain at yield and tensile strain at break. Adding OSA to polypropylene decreased the maximum flexural stress and flexural strain of maximum force. The observed SEM confirmed that the addition of OSA to pure polypropylene resulted in a significant increase in its agglomerates and filler pullout. Differential scanning calorimetry (DSC) results confirmed the addition of the OSA to pure polypropylene resulted in a significant decrease in normalized heat of crystallization, normalized enthalpy of melting. Where the degree of the crystallinity (Xc) of polymer composite decreased from 59% to 34% for 0% and 40% OSA addition, respectively. While melting temperature (Tm) of the composite did not change (167 °C) the crystallization temperature (Tc) increased from 116.6 °C to 127.1 ºC for 0% to 40% OSA addition, respectively. Water uptake, however, demonstrated different behaviour. The initial addition of OSA to polypropylene increased the water uptake property up to 4% for the 40% filler addition. The results of this study demonstrated that the OSA could be used as reinforcement material for polypropylene, as long as good mechanical properties and homogeneous morphology obtained.

Quality Analysis of Welded and Soldered Joints of Cu-Nb Microcomposite Wires

1970 ◽  
Vol 17 (1) ◽  
pp. 16-19 ◽  
Author(s):  
Nikolaj VIŠNIAKOV ◽  
Jurij NOVICKIJ ◽  
Danutė ŠČEKATUROVIENĖ ◽  
Adomas PETRAUSKAS
Keyword(s):  
Tensile Stress ◽  
Mechanical Characteristics ◽  
Testing Machine ◽  
Optical Microscope ◽  
Butt Joint ◽  
Ultimate Tensile Stress ◽  
Quality Analysis ◽  
Elongation At Break ◽  
Stress Limit ◽  
Steel Sleeve

Quality analysis of welded and soldered joints of Cu-Nb microcomposite wires has been performed. Quality and mechanical characteristics of joints as ultimate tensile stress limit and elongation at break were measured with an universal testing machine and controlled visually using an optical microscope. Two wires joints were soldered with silver and copper solders and put into steel and copper sleeve respectively. Another two wires joints were soldered with silver solder and welded without any reinforcement. Joints soldered with the silver solder and steel sleeve have demonstrated the best mechanical characteristics: ultimate tensile stress limit of 650 MPa and elongation at break of 0.85 %. Joints soldered with the copper sleeve have no advantages comparing with the soldered butt joint. Ultimate tensile stress limit and elongation at break were in 300 MPa - 350 MPa and in 0.35 % - 0.45 % ranges respectively. Two welded joints had ultimate tensile stress limit of 470 MPa and elongation at break of 0.71 %. In all joints the microstructure of Nb filaments was destroyed and mechanical properties have been specified by mechanical strength of copper and sleeve materials only.http://dx.doi.org/10.5755/j01.ms.17.1.242

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