Relationships between microstructure, fracture-surface morphology, and mechanical properties in ethylene and propylene polymers and copolymers

2000 ◽  
Vol 77 (11) ◽  
pp. 2370-2382 ◽  
Author(s):  
Fabrice Lapique ◽  
Paul Meakin ◽  
Jens Feder ◽  
Torstein J�ssang
Keyword(s):  
Mechanical Properties ◽  
Fracture Surface ◽  
Surface Morphology ◽  
Fracture Surface Morphology ◽  
Morphology And Mechanical Properties

Mechanical Properties of 5052 Al Alloy Processed by Groove Pressing

2012 ◽  
Vol 468-471 ◽  
pp. 1831-1835
Author(s):  
Kai Huai Yang ◽  
Na Lin ◽  
Shao Feng Zeng ◽  
Wen Zhe Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Fracture Surface ◽  
Surface Morphology ◽  
Fracture Mode ◽  
Room Temperature ◽  
Al Alloy ◽  
Fracture Surface Morphology ◽  
Annealed State

Three groups of commercial 5052 Al alloy sheets were subjected to groove pressing (GP) at room temperature using parallel GP, 180° cross GP and 90° cross GP, respectively. Mechanical properties and fracture modes of as-annealed and GPed samples were investigated. The microhardness of the samples processed by parallel GP increases by a factor of about 1.6 compared to the as-annealed state, and that of the samples processed by cross GP is higher. The ultimate tensile strength (UTS) increases significantly after GP, while the elongation decreases. But they are strongly dependence on the number of GP passes and the pressing modes. Besides, fracture surface morphology demonstrates that the fracture mode is ductile even after four passes. With increasing the number of GP pass, the amount of small dimples increases, and the dimples become shallow and more uniform.

scholarly journals Influence of the Texture on Mechanical Properties of the Al-Li Alloy 1441

1999 ◽  
Vol 32 (1-4) ◽  
pp. 341-353 ◽  
Author(s):  
V. F. Shamray ◽  
A. A. Babareko ◽  
O. A. Setjucov
Keyword(s):  
Mechanical Properties ◽  
Fatigue Crack ◽  
Fracture Surface ◽  
Surface Morphology ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Principal Direction ◽  
Slip Systems ◽  
Fracture Surface Morphology ◽  
Notched Specimens

Results of texture investigations in sheet and plate of the Al–Li alloy 1441 are presented. The peculiarities of fracture surface morphology formation during fatigue crack propagation tests in dependence on texture inhomogeneity are considered. The deviation of the fatigue crack from the principal direction in center-notched specimens could be related to occurrence of a {110} 〈112〉 texture. The formation of crystallographic faceted fracture surfaces results from cracks extending by slip along equally shear stressed {111} 〈110〉 slip systems ahead of the crack tip.

Effect of peanut and walnut shells powders on tensile properties and morphological test by using heat cured PMMA as a matrix for prosthetic Denture

2021 ◽  
Vol 39 (2A) ◽  
pp. 196-205
Author(s):  
Zainab M. Abdul Monem ◽  
Jawad K. Oleiwi ◽  
Qahtan A. Hamad
Keyword(s):  
Fracture Surface ◽  
Surface Morphology ◽  
Matrix Material ◽  
Weight Fraction ◽  
Fracture Surface Morphology ◽  
Ductile Materials ◽  
Walnut Shells ◽  
Peanut Shells ◽  
The Matrix ◽  
Material Powder

In the current Research , the heat cured   matrix material powder of PMMA was reinforced with peanut and walnut shells (natural powders) which are chemically treated with 5% (w/v) (NaOH) to improve the matrix bonding (PMMA) before being used as a reinforcing powder and adding to exactly similar averages particle sizes ≤ (53µm), with different weight fractions of (4, 8, and 12 wt.%). The ASTM D638 is used for composite specimens of the tensile test. The results indicated that the Elastic modulus values reached its maximum value at (8 wt.%.) when reinforced with peanut shells particles (1.053Gpa) , while ,the values of tensile strength, elongation percentage at break, decrease as the weight fraction of peanut and walnut shells powder increase and the lowest values is obtained by reinforcing with peanut shells particles to reach their minimum values at (12 wt.%.) where the lowest values of them are (29 MPa, 2.758% ) respectively. The fracture surface morphology of pure PMMA seemed to be homogenous morphology in (SEM) test, whereas the fracture surface morphology of PMMA composite reinforced by (peanut and walnut shells) powders and shows a roughness fracture surface morphology this refer to semi ductile to ductile materials.

Electrospinning/Spray: The Interaction between Graphene Nanosheets and Different Nanofibers

2020 ◽  
Vol 841 ◽  
pp. 82-86
Author(s):  
Yang Zhong Chen ◽  
Han Wang ◽  
Fei Yu Fang ◽  
Hui Mei ◽  
Li Wang
Keyword(s):  
Mechanical Properties ◽  
Surface Morphology ◽  
Mechanical Test ◽  
Graphene Nanosheets ◽  
Strain Sensors ◽  
Synergic Effect ◽  
Electrospun Nanofiber ◽  
Promising Candidate ◽  
Tensile Tester ◽  
Morphology And Mechanical Properties

The electrospun nanofiber/graphene composites is a promising candidate in the field of flexible strain sensors due to the synergic effect of graphene and the nanofibers. It is an effective way to synthesize a uniform graphene-embedded film by simultaneously electrospinning nanofibers and electrospraying graphene nanosheets. In this paper, we prepare two specimens of different materials to study the interaction between graphene nanosheets and nanofibers under the same process parameters, such as thermoplastic urethane (TPU), polyacrylonitrile (PAN). Then, morphology and mechanical properties are used to characterize the interaction. The mechanical test was conducted by the tensile tester, and the surface morphology of electrospun nanofibrous films was observed through a microscope. By comparing these results, the properties of the graphene nanosheets embedded to different nanofibers are explored. This study provides a good way to select an appropriate nanofiber matrix for the application in flexible strain sensors.

Research on Fracture Surface Morphology and Tensile Properties of Cellulose-Based Green Food Packaging Membrane Materials

2013 ◽  
Vol 469 ◽  
pp. 148-151
Author(s):  
Zhi Jian Li ◽  
Qing Jun Meng
Keyword(s):  
Tensile Strength ◽  
Fracture Surface ◽  
Surface Morphology ◽  
Food Packaging ◽  
Fracture Surface Morphology ◽  
Strength Performance ◽  
Green Food ◽  
Phase Inversion Technique ◽  
Performance Research ◽  
Membrane Strength

The Green food-packaging membranes were prepared with N-methylmorpholine-N-oxide (NMMO) as the major solvent by using L-S phase inversion technique. Scanning electron microscopy (SEM) was adopted to characterize fracture surface morphology of membrane, and tensile machine was adopted to test the membrane strength performance. Research results show with the concentration of cellulose increases from 5% to 9%, structure of membrane becomes compact, aperture size becomes small and even, value of tensile strength increases 59.6%, and value of elongation increases 67.5%. With dissolving temperature increases from 100°C to 120°C, structure of membrane becomes loose, pore size becomes big and uneven, value of tensile strength decreases 19.2%, and value of elongation decreases 13.1%. The research can provide the theoretical reference for optimizing technology, adjusting the structure of membrane, and improving the performances of membrane.

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