About the Static Mechanical Properties of Epoxy/Hemp Composites

2020 ◽  
Vol 896 ◽  
pp. 321-326
Author(s):  
Cosmin Mihai Miriţoiu ◽  
Nicolae Craciunoiu ◽  
Alexandru Bolcu ◽  
Ionuţ Daniel Geonea ◽  
Ionica Valeriu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Standard Deviation ◽  
Tensile Test ◽  
Yield Stress ◽  
Mechanical Characteristics ◽  
Breaking Strength ◽  
Young Modulus ◽  
Breaking Elongation ◽  
Static Mechanical ◽  
Static Mechanical Properties

In this paper, static mechanical characteristics for some epoxy/hemp composites are studied. By using the tensile test, the static mechanical characteristics are determined, such as: breaking strength, yield stress, Young modulus and breaking elongation. There is also determined the standard deviation. Then, by using some known theories, there is validated the static Young modulus.

About the Mechanical Properties for Composites Reinforced with Felt

2021 ◽  
Vol 42 ◽  
pp. 30-35
Author(s):  
Alexandru Ioan Rădoi ◽  
Cosmin Mihai Miriţoiu ◽  
Alexandru Bolcu ◽  
Valeriu Ionică ◽  
Alina Elena Romanescu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Testing Machine ◽  
Young Modulus ◽  
Optical Microscope ◽  
Elongation At Break ◽  
The Matrix ◽  
Static Mechanical ◽  
Static Mechanical Properties ◽  
Made In

In this paper we present some researches about the static mechanical properties for some composites made in this way: the reinforcement is made from two types of felt and the matrix is from epoxy resin Resoltech 1050 with its hardener Resoltech 1055. There are built some plates from felt/epoxy resin and from these plates there are cut some samples. The samples are tensile loaded on an universal testing machine Instron 1000 HDX which is assisted by a BlueHill software. There are determined the next mechanical properties: Young modulus, yield strength, elongation at break and breaking strength. By using an optical microscope, there are presented some images with the breaking sections.

scholarly journals Comparisons between some composites reinforced with corn leaves and different matrices

2021 ◽  
Vol 343 ◽  
pp. 01002
Author(s):  
Alexandru Ioan Rădoi ◽  
Cosmin Mihai Miriţoiu ◽  
Claudiu Nicolicescu
Keyword(s):  
Tensile Test ◽  
Mechanical Characteristics ◽  
Breaking Strength ◽  
Testing Machine ◽  
Young Modulus ◽  
Rectangular Section ◽  
Polyester Resins ◽  
Elongation At Break ◽  
Universal Testing ◽  
The Matrix

In this paper we build some composite materials reinforced with corn leaves. In order to build the samples, we have firstly created some strips in this way: we put the corn leaves, continuously, on a sheet of paper where we apply a this layer of resin (we have used epoxy and polyester ones). We have waited for the resin polymerization 48 hours, recommended by the producer. We have put the corn leaves layers in the director of the tensile test (because we will test the samples to tensile). We have made 10 strips and we have glued them together by using the same synthetic resins (epoxy and polyester). In the end we have obtained some composites reinforced with strips from corn leaves and paper sheet, and the matrix is made from epoxy and polyester resins. From the obtained plate, we have cut some samples in order to study their statically mechanical characteristics by tensile test. The samples were tested on an universal testing machine INSTRON 1000 HDX which is assisted by a software called Bluehill. The samples have a rectangular section We have determined: the elongation at break, the breaking strength and the Young modulus. We have also studied the samples breaking area..

scholarly journals Temperature-Dependent Creep Behavior and Quasi-Static Mechanical Properties of Heat-Treated Wood

Forests ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 968
Author(s):  
Dong Xing ◽  
Xinzhou Wang ◽  
Siqun Wang
Keyword(s):  
Mechanical Properties ◽  
Creep Behavior ◽  
Cell Walls ◽  
Treated Wood ◽  
Crosslinking Reaction ◽  
Depth Sensing ◽  
Temperature Dependent ◽  
Heat Treated ◽  
Static Mechanical ◽  
Static Mechanical Properties

In this paper, Berkovich depth-sensing indentation has been used to study the effects of the temperature-dependent quasi-static mechanical properties and creep deformation of heat-treated wood at temperatures from 20 °C to 180 °C. The characteristics of the load–depth curve, creep strain rate, creep compliance, and creep stress exponent of heat-treated wood are evaluated. The results showed that high temperature heat treatment improved the hardness of wood cell walls and reduced the creep rate of wood cell walls. This is mainly due to the improvement of the crystallinity of the cellulose, and the recondensation and crosslinking reaction of the lignocellulose structure. The Burgers model is well fitted to study the creep behavior of heat-treated wood cell walls under different temperatures.

Quasi-static mechanical properties of novel generalized Resch-pattern composite foldcores

2020 ◽  
pp. 095440622094000
Author(s):  
Antao Deng ◽  
Bin Ji ◽  
Xiang Zhou
Keyword(s):  
Mechanical Properties ◽  
Design Method ◽  
Absorption Capacity ◽  
Woven Fabrics ◽  
Geometric Design ◽  
Honeycomb Core ◽  
Reinforced Plastic ◽  
Static Mechanical ◽  
Laminate Thickness ◽  
Static Mechanical Properties

A new geometric design method for foldcores based on the generalized Resch patterns that allow face-to-face bonding interfaces between the core and the skins is proposed. Based on the geometric design method, a systematic numerical investigation on the quasi-static mechanical properties of the generalized Resch-based foldcores made of carbon fiber-reinforced plastic (CFRP) woven fabrics subjected to compression and shear loads is performed using the finite element method that is validated by experiments. The relationships between the mechanical properties and various geometric parameters as well as laminate thickness of the generalized Resch-based CFRP foldcores are revealed. Additionally, the mechanical properties of the generalized Resch-based CFRP foldcore are compared to those of the standard Resch-based, Miura-based foldcore, the honeycomb core, and the aluminum counterpart. It is found that the generalized Resch-based CFRP foldcore performs more stably than the honeycomb core under compression and has higher compressive and shear stiffnesses than the standard Resch-based and Miura-based foldcores and absorbs as nearly twice energy under compression as the Miura-based foldcore does. When compared with the aluminum counterpart, the CFRP model has higher weight-specific stiffness and strength but lower energy absorption capacity under shearing. The results presented in this paper can serve as the useful guideline for the design of the generalized Resch-based composite foldcore sandwich structures for various performance goals.

A Study on Estimation of S-N Curves for Structural Steels Based on their Static Mechanical Properties

2014 ◽  
Vol 891-892 ◽  
pp. 1639-1644 ◽  
Author(s):  
Kazutaka Mukoyama ◽  
Koushu Hanaki ◽  
Kenji Okada ◽  
Akiyoshi Sakaida ◽  
Atsushi Sugeta ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Evaluation Method ◽  
Materials Science ◽  
Estimation Method ◽  
Structural Steels ◽  
Metallic Materials ◽  
Fatigue Reliability ◽  
Regression Parameters ◽  
Static Mechanical ◽  
Static Mechanical Properties

The aim of this study is to develop a statistical estimation method of S-N curve for iron and structural steels by using their static mechanical properties. In this study, firstly, the S-N data for pure iron and structural steels were extracted from "Database on fatigue strength of Metallic Materials" published by the Society of Materials Science, Japan (JSMS) and S-N curve regression model was applied based on the JSMS standard, "Standard Evaluation Method of Fatigue Reliability for Metallic Materials -Standard Regression Method of S-N Curve-". Secondly, correlations between regression parameters and static mechanical properties were investigated. As a result, the relationship between the regression parameters and static mechanical properties (e.g. fatigue limit E and static tensile strength σB) showed strong correlations, respectively. Using these correlations, it is revealed that S-N curve for iron and structural steels can be predicted easily from the static mechanical properties.

Simulation studies to analyze the static mechanical properties of helical Savonius vertical axis wind turbine blade

2020 ◽  
Vol 33 ◽  
pp. 3737-3745
Author(s):  
S. Seralathan ◽  
Ch. Pavan Veera Sai Ganesh ◽  
Bhanu Prakash Reddy Venganna ◽  
N. Sai Srinivas ◽  
B. Lokesh Chowdary ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Vertical Axis ◽  
Wind Turbine Blade ◽  
Simulation Studies ◽  
Vertical Axis Wind Turbine ◽  
Static Mechanical ◽  
Static Mechanical Properties
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