scholarly journals Structural Strength of Cemented Carbides

2021 ◽  
Vol 71 (2) ◽  
pp. 291-298
Author(s):  
Soroka Olena ◽  
Rodichev Iuriy ◽  
Vorontsov Borys ◽  
Protasov Roman
Keyword(s):  
Carrying Capacity ◽  
Fracture Resistance ◽  
Structural Strength ◽  
Cemented Carbides ◽  
Local Fracture ◽  
Bending Tests ◽  
Tool Materials ◽  
Continuous Scanning ◽  
Tool Cutting ◽  
Further Development

Abstract The concept “structural strength of tool materials” got further development. The refusals of cemented carbide cutting plates, when heavy machining were analyzed. It was shown that 70…80% of refusals are the microchipping of cutting edges, tool cutting part chipping, cutting plate macrofracture. To assess cutting plate total carrying capacity and the influence of different methods of cemented carbides modification, bending tests were held. Local fracture resistance and damageability of cutting edge were assessed under its continuous scanning.

scholarly journals Social Acceptance of Aquaculture in Spain: An Instrument to Achieve Sustainability for Society

2020 ◽  
Vol 17 (18) ◽  
pp. 6628
Author(s):  
José Ruiz-Chico ◽  
José M. Biedma-Ferrer ◽  
Antonio R. Peña-Sánchez ◽  
Mercedes Jiménez-García
Keyword(s):  
Carrying Capacity ◽  
Social Acceptance ◽  
Point Of View ◽  
Saturation Point ◽  
Traditional Fishing ◽  
Further Development

Aquaculture is a technique to produce food that is under debate, due to its possible consequences for altering the economy, traditional fishing included, or the environment, even with doubts about the health of consumers. This document studies its social acceptance from the point of view of carrying capacity. This term is defined as the level at which this activity begins to be disproportionate and poses important disadvantages for society. In this context, we conducted 803 surveys in six coastal provinces in Spain. The results show that the acceptance of these products is good, implying that aquaculture is far from reaching its saturation point in society. Additionally, the respondents gave a higher priority to socio-economic objectives than to environmental ones. We can conclude that the further development of this sector is advisable in these provinces. The general perception of aquaculture is better among men, and also among higher-income consumers. Informative activities should be organized to target these more hesitant groups. Production structures should be revised to overcome biases in the population about the idea that the food obtained from aquaculture harms the environment or is less natural or healthy. The possible abuse of feed and chemicals spreads this idea, and this could affect the taste and quality adversely.

scholarly journals The Effect of Polymer Powder on the Cracking of the Subbase Layer Composed of Cold Recycled Bitumen Emulsion Mixtures

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5867
Author(s):  
Jakub Krasowski ◽  
Przemysław Buczyński ◽  
Marek Iwański
Keyword(s):  
Fracture Resistance ◽  
Asphalt Emulsion ◽  
Bending Tests ◽  
Bitumen Emulsion ◽  
Polymer Powder ◽  
Two Temperatures ◽  
Cement Mixture ◽  
Polymer Modifier ◽  
The Right ◽  
Redispersible Polymer Powder

The research was aimed at assessing the effect of the redispersible polymer powder on the fracture resistance of a subbase made of a mineral–cement mixture with a bitumen emulsion. The test was performed at two temperatures, i.e., 0 °C and 20 °C. The prepared mixtures differed in the content of cement, asphalt emulsion, and polymer modifier. Cement and redispersible polymer powder were dosed in 1.5% steps from 0.5% to 3.5% while the amount of bitumen emulsion ranged from 0.0% to 5.0%. The SCB (semi-circular bending) tests carried out in the laboratory showed the dependence of the influence of the amount of binder and polymer modifier on the fracture resistance of the recycled subbase. Mixes containing a polymer modifier in their composition are characterized by a much higher resistance to cracking than traditional mineral–cement–emulsion mixtures. An example is the doubling of the framework’s fracture toughness (KIC) when the amount of the polymer modifier is increased from 0.5% to 2.0% with a constant cement content of 0.5%. The obtained results (KIC) in this case were 2.90 and 5.81. The key is the right ratio of polymer powder and cement in the base composition.

Wear of advanced cemented carbides for metalforming tool materials

Wear ◽  
2004 ◽  
Vol 256 (7-8) ◽  
pp. 846-853 ◽  
Author(s):  
Heinrich Klaasen ◽  
Jakob Kübarsepp
Keyword(s):  
Cemented Carbides ◽  
Tool Materials

Simulation of Fracture Behavior in the Microstructure of Ceramic Tool Materials

2012 ◽  
Vol 457-458 ◽  
pp. 89-92
Author(s):  
Ting Ting Zhou ◽  
Chuan Zhen Huang ◽  
Han Lian Liu ◽  
Jun Wang ◽  
Bin Zou ◽  
...  
Keyword(s):  
Finite Element ◽  
Grain Boundary ◽  
Fracture Resistance ◽  
Fracture Behavior ◽  
Single Phase ◽  
Voronoi Tessellation ◽  
Element Model ◽  
Cohesive Element ◽  
Ceramic Tool ◽  
Tool Materials

In the paper, the Voronoi tessellation model is used to represent the microstructure of ceramic tool materials. And a finite element model based on cohesive element method has been developed to investigate the fracture behavior of the microstructure. The influences of mesh densities and cohesive parameters on the cracking patterns have been discussed. It is found that the enhancement of the grain boundary strength is beneficial for raising the fracture resistance of single-phase ceramic tool materials.

Experimental Study on Behavior of the Channel-Masonry-Concrete Composite Structures

2014 ◽  
Vol 578-579 ◽  
pp. 1251-1256
Author(s):  
Kao Zhong Zhao ◽  
Zhi Feng Zhu
Keyword(s):  
Carrying Capacity ◽  
Composite Structures ◽  
Masonry Structure ◽  
Shear Capacity ◽  
Bending Tests ◽  
Flexural Members ◽  
Safety And Reliability ◽  
Improved Stability ◽  
Capacity Calculation ◽  
New Type

channel - masonry - concrete composite structures underpinning is a new type of underpinning technology, the two channel steel and the concrete of compression flange and the masonry between the channel combined into an overall flexural members, it can used in masonry structure underpinning the transformation of the wall, it has simple construction, safety and reliability, the combination of large carrying capacity and other characteristics. Through this combination of three members in bending tests, we can get, reinforced by setting off key, channel, masonry and concrete can form a combination of flexural members to work together, channels tensile stress, concrete bear stress, masonry between the channel improved stability of the web and shear capacity of the beam, we gives the flexural capacity calculation method of the composite structure through analysis.

Numerical Analysis of Constraint and Strength Mismatch Effects on Local Fracture Resistance of Bimetallic Joints

2015 ◽  
Vol 750 ◽  
pp. 24-31 ◽  
Author(s):  
Kai Fan ◽  
Guo Zhen Wang ◽  
Jie Yang ◽  
Fu Zhen Xuan ◽  
Shan Tung Tu
Keyword(s):  
Crack Growth ◽  
Fracture Resistance ◽  
Crack Depth ◽  
Stress Triaxiality ◽  
Local Stress ◽  
Crack Growth Resistance ◽  
Specimen Thickness ◽  
Local Fracture ◽  
Out Of Plane ◽  
Crack Tips

In this paper, the finite element method (FEM) based on GTN model was used to investigate the in-plane/out-of-plane constraint and strength mismatch effects on local fracture resistance of A508/Alloy52Mb bimetallic joint. The J-resistance curves, crack growth paths and local stress-stain distributions in front of crack tips were calculated for cracks with different constraints and strength mismatches. The results show that the local fracture resistance of the interface crack in this joint is sensitive to constraint and strength mismatch effects. With increasing in-plane constraint (crack depth a/W), out-of-plane constraint (specimen thickness B) and strength mismatch degree, the plastic strain and stress triaxiality around crack tip increase, and the corresponding crack growth resistance decreases. The crack with strength mismatch factor M=1 displays a markedly higher crack growth resistance than the other cracks with M>1 and M<1. It also has been found that there is an interaction between in-plane/out-of-plane constraint and strength mismatch for the bimetallic joint. With increasing in-plane/out-of-plane constraint, strength mismatch effect on fracture toughness becomes weaken. For accurate and reliable safety design and failure assessment of the bimetallic joint structures, the effects of constraint and strength mismatch on local fracture resistance need to be considered.

Spark Plasma Sintering – new technology for obtaining tool materials

2020 ◽  
Vol 109 ◽  
pp. 64-69
Author(s):  
Joanna Wachowicz
Keyword(s):  
Mechanical Properties ◽  
Comparative Analysis ◽  
Spark Plasma Sintering ◽  
New Technology ◽  
Tool Material ◽  
Cemented Carbides ◽  
Tool Materials ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Short Time

Spark Plasma Sintering – new technology for obtaining tool materials. Cemented carbides are a valued tool material used for tools to process, among others, wood-based materials. They are traditionally obtained using high temperatures and long periods. New electric current activated sintering methods make it possible to obtain sinters with good mechanical properties in a short time and low temperature. This paper presents a comparative analysis of conventional and advanced SPS (Spark Plasma Sintering) technology of obtaining cemented carbides.

Compositional Design of Multiphase Composite Ceramic Tool Material Based on the Thermal Shock Resistance and Its Application

2004 ◽  
Vol 471-472 ◽  
pp. 21-25 ◽  
Author(s):  
Chong Hai Xu ◽  
Chuan Zhen Huang ◽  
Xing Ai
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Fracture Resistance ◽  
Tool Material ◽  
Composite Ceramic ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Ceramic Tool Material ◽  
Shock Resistance ◽  
Optimum Model

Thermal shock resistance is one of the primary properties for the ceramic cutting tool materials with perspectives in high speed machining. An optimum model for the compositional design of the composite ceramic tool materials is built based on the thermal shock resistance. The thermal stress fracture resistance factor R is used to characterize the thermal shock resistance of the ceramic material. Results show that the developed (W,Ti)C/SiC/Al2O3 multiphase ceramic tool material can be expected to achieve the highest thermal shock resistance when the volume fraction of (W,Ti)C and SiC is about 15.8% and 24.8%, respectively. Thermal fracture resistance of the (W,Ti)C/SiC/Al2O3 ceramic tool material is approximately 81-88% higher than that of the pure alumina ceramic when machining the hardened carbon steel, which coincides well with the theoretical prediction from the optimum model. It suggests that the method used here is feasible for the development of ceramic tool materials with designed thermal shock resistance.

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