Failure modes and tensile strength of screw anchors in non-cracked concrete

Uniaxial tensile tests of basalt fiber/epoxy (BF/EP) composite material with four different fiber orientations were conducted under four different fiber volume fractions, and the variations of BF/EP composite material failure modes and tensile mechanical properties were analyzed. The results show that when the fiber volume fraction is constant, the tensile strength, elastic modulus, and limiting strain of BF/EP composite material all decrease with increasing fiber orientation angle. When the fiber orientation angle is constant, the tensile strength, elastic modulus, and limiting strain of BF/EP composite material all increase with increasing fiber volume fraction. A certain degree of fiber clustering appears in the epoxy resin when the basalt fiber volume fraction is >1.2%. The fiber equidistribution coefficient and clustering fiber content were used to characterize the basalt fiber clustering effect. With the increase of fiber volume fraction, the clustering fiber content gradually increased, but the fiber equidistribution coefficient decreased. Meanwhile, based on Tsai theory, a geometric model and a tensile mechanical model of the clustering fiber are established. By considering the fiber clustering effect, the BF/EP composite material tensile strength is calculated, and the calculated values are close to the experimental results.

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Impact of tensile strength on thermal fatigue properties and failure modes of Sn-Ag-Cu-Ni solder joints

2017 18th International Conference on Electronic Packaging Technology (ICEPT) ◽

10.1109/icept.2017.8046608 ◽

2017 ◽

Cited By ~ 1

Author(s):

Xiaodong Liu ◽

Jing Shang ◽

Jianxia Hao ◽

Anmin Hu ◽

Liming Gao ◽

...

Keyword(s):

Tensile Strength ◽

Thermal Fatigue ◽

Failure Modes ◽

Solder Joints ◽

Fatigue Properties

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Development of Splice Connections for Precast Concrete Structures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.980.132 ◽

2014 ◽

Vol 980 ◽

pp. 132-136 ◽

Cited By ~ 5

Author(s):

Ahmad Baharuddin Abd Rahman ◽

Jen Hua Ling ◽

Zuhairi Abd Hamid ◽

Mohd Hanim Osman ◽

Shahrin Mohammad ◽

...

Keyword(s):

Tensile Strength ◽

Compressive Strength ◽

Failure Modes ◽

Ultimate Load ◽

Precast Concrete ◽

Tensile Load ◽

Test Results ◽

Steel Bars ◽

Embedment Length ◽

Bar Diameter

This paper presents the test results of proposed grouted sleeve connections under increasing tensile load. The objective of this research was to investigate splice connections that could provide tensile strength similar to the full tensile strength of the connected rebars. The parameters varied were splice types, splice length and rebar embedment length. The performance of the splice connection was evaluated based on the load-displacement, ultimate load, displacements and failure modes. The results show that the strength of splice connection depends on the bond strength between sleeve-to-grout and grout-to-rebar; the tensile strength of spliced steel bars and also the tensile strength of sleeve. It is observed that when the grout compressive strength is more than 60N/mm2and bar embedded length is at least 10 bar diameter, the splice connection in BS series is able to provide full tensile strength of the connected rebars.

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Two-Parameter Parabolic Mohr Strength Criterion Applied to Analyze the Results of the Brazilian Test

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.624.630 ◽

2014 ◽

Vol 624 ◽

pp. 630-634 ◽

Cited By ~ 1

Author(s):

Qi Fan ◽

Shuan Cheng Gu ◽

Bo Nan Wang ◽

Rong Bin Huang

Keyword(s):

Tensile Strength ◽

Stress State ◽

Tensile Stress ◽

Failure Modes ◽

Strength Criterion ◽

Complex Stress State ◽

Brazilian Test ◽

Practical Significance ◽

Uniaxial Tensile ◽

Two Parameter

Geotechnical engineering in tension damage is one of the major failure modes. For a long time, Brazil test has practical significance and wide application value that has been used to determine the tensile strength of rock. When the specimen center destroyed tensile stress play a major role that is the theoretical basis of Brazil test. This is uniaxial tensile stress state, but the reality is complex stress state. Theoretical analysis shows that the Brazilian test does not truly reflect the tensile strength of rock, its test results to error. In this paper, two-parameter parabolic Mohr strength criterion for this error analysis, and propose amendments to the formula.

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Study on Mechanical Features of Brazilian Splitting Fatigue Tests of Salt Rock

Advances in Civil Engineering ◽

10.1155/2016/5436240 ◽

2016 ◽

Vol 2016 ◽

pp. 1-10 ◽

Cited By ~ 4

Author(s):

Weichao Wang ◽

Mengmeng Wang ◽

Xiliang Liu

Keyword(s):

Tensile Strength ◽

Failure Modes ◽

Splitting Method ◽

Fatigue Tests ◽

Test Machine ◽

Salt Rock ◽

Tablet Splitting ◽

Splitting Test ◽

Fracturing Process ◽

Brazilian Splitting

The microtest, SEM, was carried out to study the fracture surface of salt rock after the Brazilian splitting test and splitting fatigue test were carried out with a servo-controlled test machine RMT-150B. The results indicate that the deviation of using the tablet splitting method is larger than that of using steel wire splitting method, in Brazilian splitting test of salt rock, when the conventional data processing method is adopted. There are similar deformation features in both the conventional splitting tests and uniaxial compression tests. The stress-strain curves include compaction, elasticity, yielding, and failure stage. Both the vertical deformation and horizontal deformation of splitting fatigue tests under constant average loading can be divided into three stages of “loosening-tightness-loosening.” The failure modes of splitting fatigue tests under the variational average loading are not controlled by the fracturing process curve of the conventional splitting tests. The deformation extent of fatigue tests under variational average loading is even greater than that of conventional splitting test. The tensile strength of salt rock has a relationship with crystallization conditions. Tensile strength of thick crystal salt rock is lower than the bonded strength of fine-grain crystals.

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Effects of temperature and humidity on high-strength p-aramid fibers used in body armor

Textile Research Journal ◽

10.1177/0040517520918232 ◽

2020 ◽

Vol 90 (21-22) ◽

pp. 2428-2440

Author(s):

A Engelbrecht-Wiggans ◽

F Burni ◽

E Guigues ◽

S Jiang ◽

TQ Huynh ◽

...

Keyword(s):

Tensile Strength ◽

Failure Modes ◽

Molecular Spectroscopy ◽

High Strength ◽

Tensile Tests ◽

Body Armor ◽

Maximum Temperature ◽

Fixed Temperature ◽

Degradation Rates ◽

Temperature And Humidity

To improve the reliability and design of body armor, it is imperative to understand the failure modes and the degradation rates of the materials used in armor. Despite the best efforts of manufacturers, some vulnerability of armor materials to aging due to hydrolytic or oxidative environments is expected and may result in the degradation of material properties such as tensile strength. In this work, p-aramid yarns from two manufacturers were exposed to environmental conditions of various fixed temperature and humidity combinations. The maximum temperature and humidity condition was 70℃ and 76% relative humidity (RH). Tensile tests were performed on specimens extracted at several different times over the course of at least 1 year to determine the change in ultimate tensile strength and failure strain as a function of time, temperature, and humidity. Molecular spectroscopy was used to investigate any chemical changes as a result of the aging. The p-aramid materials were found to be generally resistant to degradation at most conditions, showing changes of less than 10% only at the highest temperature and humidity conditions.

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The Perforation Resistance of Aluminum-Based Thermoplastic FMLs

Applied Composite Materials ◽

10.1007/s10443-021-09873-3 ◽

2021 ◽

Author(s):

Nassier. A. Nassir ◽

R. S. Birch ◽

W. J. Cantwell ◽

M. Al Teneiji ◽

Z. W. Guan

Keyword(s):

Tensile Strength ◽

Aluminium Alloy ◽

Cross Sections ◽

Failure Modes ◽

Rate Sensitivity ◽

Processing Temperature ◽

Initial Stiffness ◽

Maximum Displacement ◽

The Impact ◽

Metal Layers

AbstractThe perforation resistance of fibre metal laminates (FMLs) made of an S-glass fibre reinforced poly-ether-ketone-ketone (GF/PEKK) composite and an aluminium alloy (2024-T3) is investigated. Initial attention is focused on assessing the effect of the processing temperature on the tensile strength of the aluminium alloy. Here, it has shown that the processing cycle results in a reduction of approximately 35% in both the tensile strength and yield strength of the aluminium alloy. A comparison of the quasi-static and dynamic perforation responses of the FMLs highlighted the rate-sensitivity of these laminates, with the perforation energy increasing as the loading rate varies from quasi-static to impact. After testing, the FML specimens were sectioned to highlight the prevailing failure modes. An examination of the cross-sections indicated that the impact energy of the projectile is absorbed through plastic deformation and tearing of the metal layers, delamination between the composite plies and metal layers as well as fibre fracture. Finite element models (FEM), using ABAQUS/Explicit, have been developed to predict the behaviour of the FMLs subjected to dynamic loading. The outputs of the FE models were then validated against the measured experimental force–displacement traces and the observed failure modes. The results of the FE models were in a good agreement with the experimental data, in terms of the initial stiffness, maximum force and maximum displacement, as well as the perforation mechanisms.

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Analysis of woven fabric behavior under punching force

Journal of Industrial Textiles ◽

10.1177/15280837211008616 ◽

2021 ◽

pp. 152808372110086

Author(s):

Magdi El Messiry ◽

Eman Eltahan

Keyword(s):

Tensile Strength ◽

Failure Modes ◽

Woven Fabric ◽

Insignificant Change ◽

Plain Weave ◽

Factors Influencing ◽

Failure Energy ◽

Constant Rate ◽

Protective Fabrics ◽

Force Displacement

In several applications, the industrial and protective fabrics might be subjected to punching by the rigid sharp spikes. Fabric resistance to the penetration of the puncher at a constant rate was studied. The analysis of the factors influencing the resistance of the fabric and an explanation of the puncture mechanism were generated. Punching force-displacement curves were obtained and four noticeable fabric failure modes were observed. A special setup was designed so that the fabric sample can be subjected to the biaxial stresses during the puncture tests. This paper studies the puncture behaviors of the plain, twill 1/3, and twill 2/2 woven fabric designs. It was found that the increase in the number of fabric layers from one to three and the number of picks/cm from 17.6 to 27.2 would elevate the punching resistance and the punching energy by 354% and 333%, respectively, with the insignificant change in the values of specific punching force and energy. Plain weave design proved to have higher values than twill design. A high correlation was observed between fabric tensile strength, fabric Young’s modulus, fabric failure energy and its punching force and punching energy.

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Recycled Green PE Composites Reinforced with Woven and Randomly Arranged Sisal Fibres Processed by Hot Compression Moulding

Acta Technologica Agriculturae ◽

10.2478/ata-2020-0013 ◽

2020 ◽

Vol 23 (2) ◽

pp. 81-86 ◽

Cited By ~ 1

Author(s):

Bruno Dorneles De Castro ◽

Paulo Eustáquio De Faria ◽

Luciano Machado Gomes Vieira ◽

Claudia Victoria Campos Rubio ◽

Rômulo Maziero ◽

...

Keyword(s):

Tensile Strength ◽

Modulus Of Elasticity ◽

Fossil Fuels ◽

Failure Modes ◽

Low Cost ◽

Tensile Tests ◽

Hot Compression ◽

Compression Moulding ◽

Sisal Fibre ◽

Wide Range

AbstractGreen plastics are constantly being used to minimize the negative impacts of the polymers made of fossil fuels such as petroleum. Non-renewable petroleum-based products are employed in wide range of human activities, yet plastic waste accumulation represents a serious issue for the environment (Mohd Rafee et al., 2019). On the other hand, the use of natural fibres in composite materials, such as sisal fibres, in substitution for synthetic fibres, has increased considerably. The aim of this study was to develop a low-cost manufacturing process of composites with reuse of polyethylene bags made of sugarcane ethanol (green polyethylene) reinforced with sisal fibres. The hot compression moulding (185 °C) was used to mould composite structural board. Tensile tests were conducted to evaluate the influence of the reinforcement configuration on the mechanical properties of the composites, considering two arrangements: woven fibres in (0°/90°) and randomly arranged. The results indicated that the use of woven sisal fibres in (0°/90°) as reinforcement of the green HDPE showed an increase in the tensile strength (33.30%) in contrast to the pure traditional HDPE. Randomly arranged sisal fibre-reinforced green HDPE composites showed higher modulus of elasticity than pure traditional HDPE (76.83%). Composites with woven sisal fibres showed higher values for tensile strength and ultimate strain, and lower modulus of elasticity than composites with randomly arranged sisal fibres. In addition, failure modes of the composites were observed. The results showed the viability of producing these composites by the developed equipment and the potential use of these materials as structural components.

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