Enhancement of a Novel Sizing Agent in Mechanical Properties and Stab/Puncture Resistance of Kevlar Fabrics

Geotextile has been commonly used in civil and geotechnical engineering applications, and the majority of geotextiles is made of nonwoven fabrics. Therefore, this study combines crimped polyester (PET) fibers, recycled Kevlar unidirectional selvage fibers, and low-melting-point PET (LPET) fibers to form PET/Kevlar/LPET nonwoven geotextiles, and then examines how various neelde-punch depths influence mechanical properties of the resulting nonwoven geotextiles. The tensile strength, tearing strength, bursting strength, and static puncture resistance of the nonwoven fabrics increase as a result of an increase of 0.3 cm to 0.5 cm in needle-punch depth. However, an increase of 0.5 cm to 0.7 cm causes a slight decrease in all aforementioned properties.

Download Full-text

Some technical and mechanical properties of mibuna (Brassica rapa var. Nipposinica) and mizuna (Brassica rapa var. Japonica)

10.7287/peerj.preprints.1698 ◽

2016 ◽

Author(s):

Fusun Hasturk Sahin ◽

Turkan Aktas ◽

Funda Eryilmaz Acikgoz ◽

Tamer Akcay

Keyword(s):

Mechanical Properties ◽

Physical Properties ◽

Respiratory Rate ◽

Respiration Rate ◽

Brassica Rapa ◽

Dry Matter ◽

Far East ◽

Mean Values ◽

Puncture Resistance ◽

Dry Matter Loss

In this research, some physical (leaf area, leaf width, stalk width, plant mass, moisture) and mechanical properties (tear resistance, puncture resistance), color parameters (L*, a*, b*, YI) of Mibuna (Brassica rapavar. Nipposinica) and Mizuna (Brassica rapa var. Japonica) plants that are Far East Origin vegetables were determined and compared. Also respiratory rate and dry matter loss values just after harvesting and 1 week later harvesting were calculated and compared using measured CO2 concentration values. It was determined that the differences between mean values of physical properties of leaf and stalk parts of mizuna and mibuna plants were found to be statistically significant (P<0.05). CO2 measurements which were made just after harvesting and 1 week later harvesting showed that respiration rate and dry matter loss for mizuna was found faster than those values for mibuna plant. Also it was found that respiration rate and dry matter loss values determined just after harvesting was found higher than those values determined 1 week later harvesting.

Download Full-text

Bending Behavior of Concrete Beams Using Geotextiles in Tensile Areas

Paulus Civil Engineering Journal ◽

10.52722/pcej.v3i3.293 ◽

2021 ◽

Vol 3 (3) ◽

pp. 412-420

Author(s):

Sri Ponny ◽

Jonie Tanijaya ◽

Suryanti Rapang Tonapa

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Concrete Beams ◽

Improve Quality ◽

Puncture Resistance ◽

Synthetic Fibers ◽

Concrete Blocks ◽

Bending Behavior ◽

Test Objects ◽

Tearing Strength

Geotextile is made of permeable geosynthetic. Geotextile s are formed from synthetic fibers based on polymers that have high mechanical properties in tensile strength, trapezoidal tearing strength, and puncture resistance. Therefore, researchers want to increase the use of Geotextile as an added material in the tensile area of concrete blocks. The test objects used are 9 pieces of 150mm×150mm×600mm beams. The results of the research were that the addition of woven Geotextile s and non-woven Geotextile s on concrete blocks increased, for woven Geotextile s by 21.593% of beams without using Geotextile s and non-woven Geotextile s of 17.058% of beams without using Geotextile s. So the use of Geotextile s on concrete blocks can improve quality because the value of the flexural strength of beams using Geotextile s is greater than beams without using Geotextiles.

Download Full-text

Some technical and mechanical properties of mibuna (Brassica rapa var. Nipposinica) and mizuna (Brassica rapa var. Japonica)

10.7287/peerj.preprints.1698v1 ◽

2016 ◽

Cited By ~ 1

Author(s):

Fusun Hasturk Sahin ◽

Turkan Aktas ◽

Funda Eryilmaz Acikgoz ◽

Tamer Akcay

Keyword(s):

Mechanical Properties ◽

Physical Properties ◽

Respiratory Rate ◽

Respiration Rate ◽

Brassica Rapa ◽

Dry Matter ◽

Far East ◽

Mean Values ◽

Puncture Resistance ◽

Dry Matter Loss

In this research, some physical (leaf area, leaf width, stalk width, plant mass, moisture) and mechanical properties (tear resistance, puncture resistance), color parameters (L*, a*, b*, YI) of Mibuna (Brassica rapavar. Nipposinica) and Mizuna (Brassica rapa var. Japonica) plants that are Far East Origin vegetables were determined and compared. Also respiratory rate and dry matter loss values just after harvesting and 1 week later harvesting were calculated and compared using measured CO2 concentration values. It was determined that the differences between mean values of physical properties of leaf and stalk parts of mizuna and mibuna plants were found to be statistically significant (P<0.05). CO2 measurements which were made just after harvesting and 1 week later harvesting showed that respiration rate and dry matter loss for mizuna was found faster than those values for mibuna plant. Also it was found that respiration rate and dry matter loss values determined just after harvesting was found higher than those values determined 1 week later harvesting.

Download Full-text

Stag Beetle Elytra: Localized Shape Retention and Puncture/Wear Resistance

Insects ◽

10.3390/insects10120438 ◽

2019 ◽

Vol 10 (12) ◽

pp. 438

Author(s):

Lakshminath Kundanati ◽

Roberto Guarino ◽

Nicola M. Pugno

Keyword(s):

Mechanical Properties ◽

Finite Element ◽

Wear Resistance ◽

Theoretical Calculations ◽

Flexural Properties ◽

Mechanical Forces ◽

Modulus Ratio ◽

Puncture Resistance ◽

Beetle Elytra ◽

Shape Retention

Beetles are by far one of the most successful groups of insects, with large diversity in terms of number of species. A part of this success is attributed to their elytra, which provide various functions such as protection to their bodies from mechanical forces. In this study, stag beetle (Lucanus cervus) elytra were first examined for their overall flexural properties and were observed to have a localized shape-retaining snap-through mechanism, which may play a possible role in partly absorbing impact energy, e.g., during battles and falls from heights. The snap-through mechanism was validated using theoretical calculations and also finite element simulations. Elytra were also characterized to examine their puncture and wear resistance. Our results show that elytra have a puncture resistance that is much higher than that of mandible bites. The measured values of modulus and hardness of elytra exocuticle were 10.3 ± 0.8 GPa and 0.7 ± 0.1 GPa, respectively. Using the hardness-to-modulus ratio as an indicator of wear resistance, the estimated value was observed to be in the range of wear-resistant biological material such as blood worms (Glyrcera dibranchiata). Thus, our study demonstrates different mechanical properties of the stag beetle elytra, which can be explored to design shape-retaining bio-inspired composites with enhanced puncture and wear resistance.

Download Full-text

A study on design and properties of woven-nonwoven multi-layered hybrid geotextiles

Journal of Industrial Textiles ◽

10.1177/1528083720964703 ◽

2020 ◽

pp. 152808372096470

Author(s):

Ting-Ting Li ◽

Xiangyu Zhou ◽

Zhike Wang ◽

Yuyang Fan ◽

Xiayun Zhang ◽

...

Keyword(s):

Mechanical Properties ◽

Soil Conservation ◽

Areal Density ◽

Nonwoven Fabric ◽

Test Results ◽

Natural Conditions ◽

Puncture Resistance ◽

Stabilized Soil ◽

Complicated Conditions ◽

Pore Fraction

The area of forests continues decreasing while the water/soil loss becomes worse. In these complicated environments, mechanical properties, stability, high modulus and low elongation of geotextiles are required. On a premise of the acquisition of good mechanical properties and the improvement in the deformation and puncture resistance of nonwoven fabric, woven/nonwoven hybrid geotextiles are designed and made with needle punch processing technology in this study. The test results indicate that the mechanical properties of hybrid geotextiles are improved significantly when the areal density of nylon fabrics is increased. In particular, with the areal density of 400 g/m2, hybrid geotextiles exhibit the maximal mechanical properties and puncture resistance. Moreover, the pore fraction of hybrid geotextiles decreases as a result of a rise in the areal density of nylon top/bottom layers. The use of a 3 D mesh fabric as the interlayer provides the needle punched composite geotextiles with the highest tensile resistance, puncture resistance. The composite geotextiles are treated with acid and alkali to simulate the corrosion under natural conditions of stabilized soil. The resultant geotextile has good mechanical properties and acid/alkali degradation resistance. This allows the hybrid geotextiles to stabilize water and soil conservation in complicated conditions.

Download Full-text

Stag Beetle Elytra: Localized Shape-Retaining, Puncture and Wear-Resistant

10.20944/preprints201902.0132.v1 ◽

2019 ◽

Author(s):

Lakshminath Kundanati ◽

Roberto Guarino ◽

Nicola M. Pugno

Keyword(s):

Mechanical Properties ◽

Finite Element ◽

Wear Resistance ◽

Theoretical Calculations ◽

Flexural Properties ◽

Mechanical Forces ◽

Modulus Ratio ◽

Wear Resistant ◽

Puncture Resistance ◽

Beetle Elytra

Beetles are by far one of the most successful and diverse insect species. A part of this success is attributed to their elytra which provide various functions such as protection to their bodies from mechanical forces and the harmful environmental factors. In this study, Stag beetle (Lucanus cervus) elytra were first examined for their overall flexural properties and were observed to have a localized shape retaining snap-through mechanism which could play a crucial role in energy absorption, e.g. during battles and falls from heights. The snap-through mechanism was validated using theoretical calculations and also finite element simulations. Elytra were also characterized to examine their puncture and wear resistance. Our results show that elytra resisted puncture up to a force of 1.8±0.4 N and have puncture resistance compared to that of commercially available puncture resistant gloves. The measured values of modulus and hardness of elytra exocuticle were 10.3±0.8 GPa and 0.7±0.1 GPa. Using the hardness to modulus ratio as an indicator of wear resistance, the estimated value was observed to be in the range of wear resistant biological materials. Thus, our study demonstrates different mechanical properties of the stag beetle elytra which can be explored to design shape retaining bio-inspired composites with enhanced puncture and wear resistance.

Download Full-text