Search results

Optimization of the Specimen Geometry of Unidirectional Reinforced Composites with a Fibre Orientation of 90° for Tensile, Quasi-Static and Fatigue Tests Christian SCHNEIDER1,a, Matthias DRVODERIC2,b, Clara SCHUECKER2,c and Gerald PINTER1,d* 1,2Montanuniversität Leoben, Material Science and Testing of Polymers, Otto-Glöckel-Straße 2, 8700 Leoben, AT achristian.schneider@unileoben.ac.at, bmatthias.drvoderic@unileoben.ac.at, cclara.schuecker@unileoben.ac.at, dgerald.pinter@unileoben.ac.at Keywords: CFRP, composite, carbon fiber, fatigue, unidirectional, finite element simulation, mechanical testing, Wöhler Abstract.
In this paper, a test specimen design was determined which is well suited for testing the material properties transverse to the fiber direction by calculating the influence of geometric details of shoulder bar specimens with the help of finite element simulation.
Since the stress concentrations in the shoulder and in the clamping relax relatively quickly, a shorter test area than in reality does not affect the results as long as the areas of stress concentrations do not overlap. [3].
The influencing factors which have been simulated are shoulder geometry, width of the clamping, influence of the tab, tab-offset and influences of the adhesive layer.
Mechanical Testing Regarding the results from simulation, two different proposals for a specimen design were developed and the tab-offset with the best simulation results was chosen.

And laser cladding cermets coating on metal surface could get especially higher properties [1-3].
Rare earth elements have purify, modificating and alloying effects to many kinds of metals, which could especially improve mechanical, hot-working, high temperature oxidation resistance, abrasion resistance and corrosion resistance properties of metallic materials.
In these experiments, rare earth elements were added into laser cladding made nickel based metal-ceramic composite coating to increase its mechanical and anti-cracking properties.
Cladding layer could be divided into three regions: cladding region, bonding region and heat-affected zone of the substrate.
Rare earths of CeO2 could increase wearing properties of the laser cladding layer.

Introduction The properties of asphalt mastic, a composite material consisting of asphalt binder and filler, influences the overall mechanical properties of asphalt mixtures [1, 2].
The huge difference is the key factor which affecting the stability of asphalt mastic.
Stronger the interaction is, better the interfacial properties and the performances of asphalt mixture is [3].
Zhan et al [5] used the dynamic mechanical analysis (DMA) to study the microstructure of asphalt mastic, according to the temperature dependence of Han curve, frequency dependence of dynamic viscoelastic properties, such as storage modulus, loss modulus and phase angle.
In this paper, dynamic shear rheometer (DSR) was used to measure viscoelastic properties of asphalt mastic mixed with different fillers, and the mechanical volume filling effects are discussed.

The microstructure and mechanical properties of blended cements hydrated at various temperatures.
Mechanical activation of granulated blast furnace slag and its effect on the properties and structure of portland slag cement.
Concrete : microstructure, properties, and materials, McGraw-Hill
Evolution of mechanical properties of concrete containing ground granulated blast furnace slag and effects on the scaling resistance test at 28 days.
Effects of metakaolin and silica fume on properties of concrete.

Besides the nature of constituent material properties, the microstructure of fillers also plays an important role in the mechanical properties of the filled rubbers.
It has been known that the CB network is responsible for the DC (direct current) conductivity [1,2] and the unique mechanical behavior, i.e., the strain amplitude dependence of the dynamic viscoelastic properties [3].
Many investigators [1,4,5,6] studied the relation between the characteristics of CB network and the physical properties of filled rubber for fully understanding of the reinforcing mechanism and for the potential applications in developing a new kind of mechanical-electrical sensor [5].
This electrical property might be suitable for application to characterize the CB network and to obtain useful information about the structure and properties of CB networks in rubbers.
Besides the specific surface, CDBP, average number of primary particles per aggregate and CB aggregate distribution, other factors, e.g., the CB-polymer interaction, the surface activity of CB aggregate and the shape factor of CB aggregate which is generally defined by the ratio of the maximum dimension to the diameter of the equivalent sphere, affect the electrical resistance of CB composites.

Introduction Fiber-reinforced ceramic matrix composites have been widely applied in many fields of modern industry, defense and aerospace due to their good physical and mechanical properties.
Most of the studies are focused on the preparation process of the composite materials, mechanical properties and failure mechanism.
The different of fibers structure on each surface cause different mechanical properties in directions. 2.2 Grinding experimental apparatus MK9025 CNC optical profile grinding machine is used in the experiment.
The physical and mechanical properties of the matrix and fibers are quite different.
Grinding surface damage is mainly the fracture of fibers, with a large number of the matrix broken. 3.2 The effects of grinding parameters on Grinding force In the process of fiber-reinforced ceramic matrix composites grinding, grinding parameters is one of the main factors which affect the grinding process.

While the matrix material surrounds and supports the reinforcement by maintaining their relative positions, the reinforcements, on the other hand, pass on their extraordinary mechanical and physical properties to enhance the matrix elements [3].
Composite degradation factors that initiate or accelerate the deterioration of building materials, and components can be categorized into the following factors [13]: · Weathering.
Steel Shear Steel can shear under imposed loads, steel members to be designed to suit loading criteria Steel Buckling Steel can distort and fail under imposed loads when not laterally restrained deforming the appearance of the beam Table 2 summarises the degradation factors affecting the service life of building components.
This highlights the importance of such factors during the material design and manufacturing stages.
Composite materials degradation factors.

Box 20, 53851 Lappeenranta, Finland aolli.vantsi@lut.fi, btimo.karki@lut.fi Keywords: Wood plastic composite, Mineral wool, Recycling, Fire properties, Heat build-up Abstract.
It has been shown that inorganic mineral fillers can improve the fire properties of WPCs[14].
The optical properties of composites are a key factor in their heat build-up behavior [17].
Conclusions The addition of recycled mineral wool into wood plastic composites affected the heat build-up and fire properties of composites.
Optical properties, mainly a* and L* values of CIE L*a*b* color system, were found to be the main factors affecting the heat build-up of the studied composites.

Recent research on application of carbon nano tubes (CNT), both single-walled and multi-walled, shows significant increase in mechanical properties of concrete.
The size and exceptional mechanical properties of CNT show their high potential to be used to produce high performance next generation cementitious composites.
A comprehensive study [12] conducted by one of the authors also found improved mechanical properties of MWNT reinforced cement composites.
A number of factors such as particle aggregation, rapid hydration, a high water to cement ratio, and the lack of gypsum can be hold responsible for this phenomenon.
Gum'ko: Small but Strong: A Review of the Mechanical Properties of Carbon Nanotube-Polymer Composites.

It offers the possibility of applying several types of static or dynamic stress on bone tissue with laws of behavior (elastic, elastoplastic) and different mechanical properties.
In general, modeling by the finite element method in biomechanics requires a precise description: - Prosthesis (three-dimensional geometry, mechanical properties, characterization of the bone-implant interface); - Bone structure (three-dimensional geometry, distribution of bone densities, mechanical properties, behavioral laws); - Boundary condition of the prothesis-bone system (forces of contact, muscular forces).
Mechanical properties The mechanical properties of the materials of the dental prosthesis and the mandibular bone of this study are summarized in Table 2.
Interface conditions In general, the success of the treatment depends on many factors affecting the bone-implant, implant-abutment and abutment-prosthesis interfaces [2].
The elastic properties of a human mandible.