Analysis of Influence Factors on Strength of Mudstone with Soft-Hard Alternant Strata in Nanning Basin

The mudstone is formed under the special environment with soft-hard alternant strata in Nanning Basin . The composition,engineering and mechanical properties have a certain complexity and specificity,so the parameters of the mudstone are discrete and variable by which the strength characteristics are influenced. According to the problem of the strength of mudstone,the influence factor is analysed on the strength of mudstone with soft-hard alternant strata in Nanning Basin through the composition, stress history, geological environment, water-rock interaction and disturbance, etc.. The analysis shows that in the final analysis the reduction of the mechanical properties of mudstone is due to structural damage, stress weakening and energy weakening.And the measures of improving the bearing capacity of mudstone are discussed from the test methods, construction control measures, in situ testing and engineering design.

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Test Methods for Mechanical Properties of Structural Adhesives

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.97-101.814 ◽

2010 ◽

Vol 97-101 ◽

pp. 814-817 ◽

Cited By ~ 1

Author(s):

Jun Deng

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Shear Strength ◽

Elastic Modulus ◽

Butt Joint ◽

Test Methods ◽

Joint Specimen ◽

Lap Shear ◽

Better Than

One of the greatest drawbacks to predicting the behaviour of bonded joints has been the lack of reliable data on the mechanical properties of adhesives. In this study, methods for determining mechanical properties of structural adhesive were discussed. The Young’s modulus, Poisson’s ratio and tensile strength of the adhesive were tested by dogbone specimens (bulk form) and butt joint specimens (in situ form). The shear modulus and shear strength were test by V-notched specimens (bulk form) and thick adherend lap-shear (TALS) joint specimens (in situ form). The test results show that the elastic modulus provided by the manufacturer is too low, the dogbone specimen is better than the butt joint specimen to test the tensile strength and elastic modulus and the TALS joint specimen is better than the V-notched specimen to test the shear strength.

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Study on the Mechanical Properties of Fly-Ash-Based Light-Weighted Porous Geopolymer and Its Utilization in Roof-Adaptive End Filling Technology

Molecules ◽

10.3390/molecules26154450 ◽

2021 ◽

Vol 26 (15) ◽

pp. 4450

Author(s):

Luchang Xiong ◽

Bowen Fan ◽

Zhijun Wan ◽

Zhaoyang Zhang ◽

Yuan Zhang ◽

...

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

Porous Structure ◽

High Efficiency ◽

Influence Factor ◽

Structure Model ◽

Plastic Yielding ◽

Working Face ◽

Secondary Air

This paper aims to study the porous structure and the mechanical properties of fly-ash-based light-weighted porous geopolymer (FBLPG), exploring the feasibility of using it in roof-adaptive end filling technology based on its in-situ foaming characteristics and plastic yielding performance. A porous structure model of FBLPG during both the slurry and solid period was established to study their influence factor. In addition, this study also built a planar structure model in the shape of a honeycomb with bore walls, proving that the bore walls possess the characteristics of isotropic force. FBLPG shows a peculiar plastic yielding performance in the experiment where its stress stays stable with the gradual increase of the deformation, which can guarantee the stability of a filling body under the cycled load from the roof. At the same time, the in-situ foaming process combined with the unique filling technique can make the FBLPG filling body fully in contact with the irregular roof. This roof-adaptive end filling technology makes it a successful application in plugging the 1305 working face, which avoids problems of the low tight-connection ratio and secondary air-leakage channel resulted from the traditional filling technology, effectively improving coal production in terms of safety and high efficiency.

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The Influence of Processing Parameters on Mechanical Properties and Microstructure of Welding Zone for Ti3Al-TC4 Dual Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.445 ◽

2005 ◽

Vol 475-479 ◽

pp. 445-448

Author(s):

Ze Kun Yao ◽

Xinmin Liang ◽

Hong Zhen Guo ◽

Bin Wang ◽

Guo Hui Li ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Test ◽

Room Temperature ◽

Influence Factor ◽

Weld Zone ◽

Influence Factors ◽

Processing Parameters ◽

Air Cooling ◽

Optimum Parameters ◽

Heat Treatment Regime

It has been investigated that the influence of processing parameters on mechanical properties of weld zone for Ti-24Al-15Nb-1.5Mo and TC4 dual alloy welded by electron beam in vacuum. The results shows the remarkable influence factors are heat treatment regime and deformation for yield strength of welded dual alloy samples at room temperature tensile test, and the remarkable influence factor is forging temperature for the elongation in tensile test at 500°C. From the combined analysis about other properties at room temperature and 500°C, the microstructure of the weld seam, it can been gotten the optimum parameters of processing dual alloy, i.e. forging at 1020°C, soaking for 12 hour at 700°C, air cooling, about 40% deformation and using billet of rolling state.

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Dynamics of Nanoparticle Chain Aggregates of Carbon Under Tension

MRS Proceedings ◽

10.1557/proc-778-u4.4 ◽

2003 ◽

Vol 778 ◽

Author(s):

Rajdip Bandyopadhyaya ◽

Weizhi Rong ◽

Yong J. Suh ◽

Sheldon K. Friedlander

Keyword(s):

Mechanical Properties ◽

Carbon Black ◽

Polymer Film ◽

Elastic Behavior ◽

Small Strains ◽

Transmission Electron ◽

Chain Aggregates ◽

Nanoparticle Chains ◽

Reinforcing Filler

AbstractCarbon black in the form of nanoparticle chains is used as a reinforcing filler in elastomers. However, the dynamics of the filler particles under tension and their role in the improvement of the mechanical properties of rubber are not well understood. We have studied experimentally the dynamics of isolated nanoparticle chain aggregates (NCAs) of carbon made by laser ablation, and also that of carbon black embedded in a polymer film. In situ studies of stretching and contraction of such chains in the transmission electron microscope (TEM) were conducted under different maximum values of strain. Stretching causes initially folded NCA to reorganize into a straight, taut configuration. Further stretching leads to either plastic deformation and breakage (at 37.4% strain) or to a partial elastic behavior of the chain at small strains (e.g. 2.3% strain). For all cases the chains were very flexible under tension. Similar reorientation and stretching was observed for carbon black chains embedded in a polymer film. Such flexible and elastic nature of NCAs point towards a possible mechanism of reinforcement of rubber by carbon black fillers.

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