Fracture Behavior of Organic Silicon Rubber at Different Extension Rate

Fracture behavior of organic silicon rubber at the extension rate of 100, 300, 500 and 700 mm/min at room temperature was studied in this paper. The fracture surface morphology was observed by scanning electron microscopy (SEM). Effects of different extension rate on the tensile strength tensile fracture behavior and mechanism were investigated. The results showed that fracture of the organic silicon rubber was composed by flat region and rough region, while the rough region was relatively small. With the increasing extension rate, the area of flat region enlarged while rough region decreased, and the secondary cracks appeared when the extension rate reached critical value. The relationship of the tensile strength and elongation with the extension rate were similar, both of which rised and then droped as the extension rate increased, and further studies were needed for the fracture mechanism.

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Influence of Heat Treatment Process on Tensile Fracture Behavior of Cu-Based Metallic Glass

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.742.170 ◽

2013 ◽

Vol 742 ◽

pp. 170-174

Author(s):

Ling Zhang ◽

De Chun Luo ◽

Xiang Bin Yi

Keyword(s):

Tensile Strength ◽

Fracture Behavior ◽

Isothermal Annealing ◽

Flow Behavior ◽

Performance Testing ◽

Fracture Morphology ◽

Test Sample ◽

Fracture Pattern ◽

Tensile Fracture ◽

Venation Pattern

The Cu50Zr42Al8dumbbell-shaped alloy with original scale distance of 25 mm and diameters of 4.5 mm was prepared by the suspend melting-copper mould suction casting. The structure tensile performance testing and the fracture morphology observation of Cu50Zr42Al8BMG as-quenched and 400k/1h isothermal annealing were investigated, respectively. The deformation and fracture behavior of samples had been studied. The results showed that the structure of all samples were composed of amorphous phase and possess good glass formation abilitysample as-quenched is always in the elastic deformation stage during elongation and the tensile strength is 629MPa; however ,for specimen after 400k/1h isothermal annealing ,the yield phenomenon occurs before breaking and the maximum tensile strength is 755Mpa, and the same time, the maximum failure extensibility increases from 0.56% for sample as-quenched to 0.80% for 400k/1h isothermal annealing. The fracture pattern of test sample at annealing assumes venation pattern, which is similar to fractography of Cu50Zr42Al8BMG as-quenched, in addition, which appeared apparent viscous flow behavior and melting characteristics.

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Comparative Study on Fracture Behavior of the Reinforced Jointed Rock

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.2562 ◽

2011 ◽

Vol 250-253 ◽

pp. 2562-2565

Author(s):

Ming Tian Li ◽

Shu Cai Li ◽

Ning Zhang

Keyword(s):

Fracture Behavior ◽

Tensile Tests ◽

Jointed Rock ◽

Experimental Results ◽

Tensile Fracture ◽

Uniaxial Tensile ◽

Rock Masses ◽

Jointed Rock Masses ◽

Stable Crack Propagation ◽

Secondary Cracks

In order to understand the anchorage mechanisms the fracture behavior of jointed rock masses reinforced with rockbolts was compared with those of the jointed rock masses without rockbolts. Firstly the unaixal tensile tests were conducted on the specimens with inclined surface cracks, horizontal through cracks and horizontal a quarter through cracks to investigate the crack growth of the jointed rock masses without rockbolts. The experimental results show the fracture of the specimens without rockbolts belonged to tensile fracture in the catastrophic way under uniaxial tensile conditions. However the experimental results of the specimens reinforced with rockbolts show that rockolts can change the initiation of the pre-existing cracks, incur the secondary cracks and there existed stable crack propagation.

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Comparison of Tensile Fracture Behavior between Si-Ti-C-O Fiber Bundle (Yarn), Woven Fabric of Yarn and Laminated Composite of the Si-Ti-C-O Fabric / Mullite Filler / Polytitanocarbosilane System

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.287.432 ◽

2005 ◽

Vol 287 ◽

pp. 432-437

Author(s):

Tomoyuki Maeda ◽

Yoshihiro Hirata ◽

Joe Sugimoto ◽

Soichiro Sameshima ◽

Toshifumi Yoshidome ◽

...

Keyword(s):

Tensile Strength ◽

Fracture Behavior ◽

Laminated Composite ◽

Fracture Probability ◽

Woven Fabric ◽

Tensile Fracture ◽

Normal Distribution Function ◽

Pyrolysis Method ◽

Polymer Impregnation ◽

Xylene Solution

A polytitanocarbosilane (20-30 mass%)-xylene solution was infiltrated into a porous laminated composite with 35-40 vol% Si-Ti-C-O fabric of 11 diameter fiber and 15-25 vol% mullite filler, and decomposed at 1000°C in an Ar atmosphere. This polymer impregnation and pyrolysis method was repeated 8 times to produce the composites of 76-82 % theoretical density. The yarn (662-765 filament / yarn), fabric and composite provided the following average strengths : 1240 MPa for the yarn; 768 MPa for the fabric; 117 MPa for the composite. The fracture probability of the yarn, fabric and composite was well fitted by the normal distribution function. The tensile strength of the composite was interpreted by the product of the effective fiber content, the Young's modulus of the fiber and elongation of the composite.

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Tensile Fracture Characteristics of Polysulfide Sealants Immersed in Oil

Materials Science Forum ◽

10.4028/www.scientific.net/msf.689.455 ◽

2011 ◽

Vol 689 ◽

pp. 455-460 ◽

Cited By ~ 3

Author(s):

Mei Li Ding ◽

Wei Fang Zhang ◽

Wei Guo Hou ◽

Xiao Liu

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Tensile Test ◽

Immersion Time ◽

Fracture Behavior ◽

Tensile Fracture ◽

Fracture Characteristics ◽

Oil Immersion ◽

Rough Region ◽

Scanning Electron

In this paper, the morphology characteristic of tensile test fracture of polysulfide sealants immersed in oil for different time was observed through scanning electron microscopy. Combined with the performance data of tensile test, the effect of oil immersion time on the properties and fracture behavior of sealant was studied. The results show that the fracture of polysulfide sealants includes rough region and flat region. After being immersed in oil, the area of rough region diminishes and the roughness of fracture decreases. Within 168h, oil immersion time has little effect on the tensile strength and elongation of sealants.

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Evaluation on Tensile Behavior Characteristics of Undisturbed Loess

Energies ◽

10.3390/en11081974 ◽

2018 ◽

Vol 11 (8) ◽

pp. 1974 ◽

Cited By ~ 2

Author(s):

Shixin He ◽

Haibo Bai ◽

Zhiwei Xu

Keyword(s):

Tensile Strength ◽

Water Content ◽

Soil Mechanics ◽

Tensile Fracture ◽

Plastic Limit ◽

Direct Tension ◽

Strain Relationship ◽

Behavior Characteristics ◽

Relationship Of ◽

The Impact

Tensile strength is one significant parameter involved in tensile fracture in soil mechanics. In this paper, a stress-controlled, uniaxial, direct-tension test apparatus was developed to investigate the tensile properties of soils. A limited number of investigations have examined the impact of anisotropy and loading interval on the tensile strength of undisturbed loess. The deformation and strains generated were also examined during the tests. It was revealed that anisotropy was an important factor affecting tensile strength of undisturbed loess, and the effect of loading interval on tensile strength significantly depended on water content. It was negligible while the water content was below the plastic limit. However, when the water content was above the plastic limit, the loading interval not only affected the tensile strength, but also the failure displacement and stiffness response of the soil. Two patterns of tensile fracture were summarized and discussed. Moreover, an empirical constitutive relation was proposed to describe the stress-strain relationship of undisturbed loess and its robustness was validated by the experimental data.

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Analysis of the Microstructure and Mechanical Properties of TiBw/Ti-6Al-4V Ti Matrix Composite Joint Fabricated Using TiCuNiZr Amorphous Brazing Filler Metal

Materials ◽

10.3390/ma14040875 ◽

2021 ◽

Vol 14 (4) ◽

pp. 875

Author(s):

Hao Tian ◽

Jianchao He ◽

Jinbao Hou ◽

Yanlong Lv

Keyword(s):

Mechanical Properties ◽

Base Metal ◽

Matrix Composite ◽

Room Temperature ◽

Filler Metal ◽

Ceramic Fiber ◽

Tensile Fracture ◽

Alloy Matrix ◽

Composite Joint ◽

Secondary Cracks

TiB crystal whiskers (TiBw) can be synthesized in situ in Ti alloy matrix through powder metallurgy for the preparation of a new type of ceramic fiber-reinforced Ti matrix composite (TMC) TiBw/Ti-6Al-4V. In the TiBw/Ti-6Al-4V TMC, the reinforced phase/matrix interface is clean and has superior comprehensive mechanical properties, but its machinability is degraded. Hence, the bonding of reliable materials is important. To further optimize the TiBw/Ti-6Al-4V brazing technology and determine the relationship between the microstructure and tensile property of the brazed joint, results demonstrate that the elements of brazing filler metal are under sufficient and uniform diffusion, the microstructure is the typical Widmanstätten structure, and fine granular compounds in β phase are observed. The average tensile strength of the brazing specimen is 998 MPa under room temperature, which is 97.3% of that of the base metal. During the high-temperature (400 °C) tensile process, a fracture occurred at the base metal of the highest tensile test specimen with strength reaching 689 MPa, and the tensile fracture involved a combination of intergranular and transgranular modes at both room temperature and 400 °C. The fracture surface has dimples, secondary cracks are generated by the fracture of TiB whiskers, and large holes form when whole TiB whiskers are removed. The proposed algorithm provides evidence for promoting the application of TiBw/Ti-6Al-4V TMCs in practical production.

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Cohesive character in Alfisols, Ultisol and Oxisols in Northeast of Brazil: Relationship of tensile strength with silicon, aluminum and iron from poorly crystalline compounds

Geoderma Regional ◽

10.1016/j.geodrs.2021.e00361 ◽

2021 ◽

Vol 24 ◽

pp. e00361

Author(s):

Jaedson Cláudio Anunciato Mota ◽

Cillas Pollicarto da Silva ◽

Brivaldo Gomes de Almeida ◽

Ricardo Espíndola Romero ◽

Thiago Leite de Alencar ◽

...

Keyword(s):

Tensile Strength ◽

Relationship Of

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An experimental method to determine the intralaminar fracture toughness of high-strength carbon-fibre reinforced composite aerostructures

The Aeronautical Journal ◽

10.1017/aer.2018.78 ◽

2018 ◽

Vol 122 (1255) ◽

pp. 1352-1370 ◽

Cited By ~ 9

Author(s):

H. Liu ◽

B.G. Falzon ◽

G. Catalanotti ◽

W. Tan

Keyword(s):

Fracture Toughness ◽

Tensile Strength ◽

Crack Tip ◽

Damage Mechanism ◽

Calibration Method ◽

Compact Tension ◽

Tensile Fracture ◽

High Tensile Strength ◽

Physical Test ◽

Area Method

ABSTRACTCarbon fibres with high tensile strength are being increasingly utilised in the manufacture of advanced composite aerostructures. A Modified Compact Tension (MCT) specimen is often deployed to measure the longitudinal intralaminar fracture toughness but a high tensile strength often leads to premature damage away from the crack tip. We present an approach whereby the MCT specimen is supported by external fixtures to prevent premature damage. In addition, we have developed a novel measurement technique, based on the fibre failure strain and C-scanning, to determine the crack length in the presence of surface sublaminate delamination which masks the crack tip location. A set of cross-ply specimens, with a ((90/0)s)4 layup, were manufactured from an IMS60/epoxy composite system Two different data reduction schemes, compliance calibration and the area method, are used to determine the fibre-dominated initiation and propagation intralaminar fracture toughness values. Propagation values of fracture toughness were measured at 774.9 ± 5.2% kJ/m2 and 768.5 ± 4.1% kJ/m2, when using the compliance calibration method and the area method, respectively. Scanning Electron Microscopy (SEM) is carried out on the fracture surface to obtain insight into the damage mechanism of high-tensile-strength fibre-reinforced unidirectional composites. The measured tensile fracture toughness value is used in a fully validated computational model to simulate the physical test.

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