Modelling and bending strength analysis of cylindrical gears with arcuate tooth trace

2015 ◽  
Vol 13 (2) ◽  
pp. 77-86 ◽  
Author(s):  
F Jia ◽  
L Hou ◽  
Y Wei ◽  
B Li ◽  
Y You
Keyword(s):  
Bending Strength ◽  
Strength Analysis ◽  
Cylindrical Gears

scholarly journals Knitted Meshes for Reinforcing Building Composites

2019 ◽  
Vol 27 (4(136)) ◽  
pp. 102-111
Author(s):  
Zbigniew Mikołajczyk ◽  
Katarzyna Pieklak ◽  
Aleksandra Roszak
Keyword(s):  
Concrete Beam ◽  
Bending Strength ◽  
Relative Elongation ◽  
Testing Machine ◽  
Strength Analysis ◽  
Knitted Fabrics ◽  
Three Point Bending ◽  
Concrete Mass ◽  
Frp Composites ◽  
Technical Textiles

Modern technical textiles, including knitted fabrics, are widely used in the construction industry. Regarding textiles in concrete reinforcement, methods based on shredded fibres, meshes, reinforcing mats, woven textiles and knitted DOStapes are frequently used as underlays of concrete constructions. Textiles are also used in the reinforcement of fibrous FRP composites. The research presented focused on producing composites made of MapeiMapefill concrete mass with reinforcement in the form of three variants of knitted meshes made of 228 tex polyamide threads, polypropylene threads of 6.3 tex and 203 tex glass threads, as well as identification of their mechanical properties. The mesh variant made of glass fibre is especially noteworthy, as its strength is more than three times higher than that of polyamide meshes. At the same time, a very small relative elongation of 3% is observed for this variant of knitted fabric, which is a desired property regarding the comparatively low stretching extension of concrete. In the process of making the composites, the adhesion of the concrete mass to the surface of the threads was analyzed. For this purpose, a "Sopro HE449" type agent was used. Composite beams were subjected to a three-point bending strength analysis on a testing machine. The results of strength measurements of the composites obtained prove that those with glass fibres demonstrate a threefold increase in strength compared to the original concrete beam.

scholarly journals Strength Analysis and Stress-Strain Deformation Behavior of 3 mol% Y-TZP and 21 wt.% Al2O3-3 mol% Y-TZP

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3903
Author(s):  
Liliya Vladislavova ◽  
Tomasz Smolorz ◽  
Nina Orlovskaya ◽  
Mykola Lugovy ◽  
Michael J. Reece ◽  
...  
Keyword(s):  
Elastic Deformation ◽  
Deformation Behavior ◽  
Ceramic Composite ◽  
Bending Strength ◽  
Domain Switching ◽  
Small Deviation ◽  
Strength Analysis ◽  
Stress Strain ◽  
Linear Elastic ◽  
Four Point Bending

The mechanical behavior of 3 mol% Y2O3-ZrO2 ceramic and 21 wt.% Al2O3-3 mol% Y2O3-ZrO2 ceramic composite with submicron grain size was studied. Mechanical properties, such as hardness, Young’s modulus, four-point bending strength, and fracture toughness of both materials were measured. Linear stress-strain deformation behavior of both 3 mol% Y2O3-ZrO2 and 21 wt.% Al2O3-3 mol% Y2O3-ZrO2 was observed in flexure, both at room temperature and at 400 °C. A small deviation from linear elastic deformation was detected in 21 wt.% Al2O3-3 mol% Y2O3-ZrO2 ceramic composite when loaded above a stress of 1500 MPa. Therefore, it was concluded that only elastic deformation occurred at low stresses upon loading, which exclude the presence of domain switching in zirconia upon bending under the loading conditions of this study.

scholarly journals Glide analysis and bone strength tests indicate powered flight capabilities in hatchling pterosaurs

2017 ◽  
Author(s):  
Mark P Witton ◽  
Elizabeth Martin-Silverstone ◽  
Darren Naish
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Bone Strength ◽  
Bending Strength ◽  
Skeletal Development ◽  
Maximum Size ◽  
Strength Analysis ◽  
Life Stages ◽  
Strength Tests ◽  
Very High

Pterosaur embryos and ‘hatchling’ specimens show a surprising level of skeletal development including well-ossified skeletons and large wings. This has prompted interpretations of pterosaurs as being flight-capable from the earliest ontogenetic stages, contrasting them against the majority of other flying animals, living or extinct. Though popular, this hypothesis is not universally accepted. Some authors propose that pterosaurs only became flight capable once they reached 50% of maximum size, explaining a slowing of growth rate in later ontogeny as metabolic resources were diverted into an energy-demanding form of locomotion. We investigated these hypotheses through glide performance and wing bone strength analysis on hatchling-grade specimens of two pterosaurs, Pterodaustro guinazui and Sinopterus dongi. We found that hatchling pterosaurs were excellent gliders, but with a wing ecomorphology more comparable to powered fliers than obligate gliders. Bone strength analysis shows that hatchling pterosaur wing bones are structurally identical to those of larger pterosaurs and – because of their very low body masses – their bending strength relative to body weight is very high, comparable to or exceeding the greatest values estimated for larger, more mature pterosaurs. Hatchling pterosaurs are thus as mechanically adapted to powered flight stresses as other pterosaurs, if not moreso. Together with our glide tests, this result supports interpretations of hatchling pterosaurs as flight-capable. Size differences between pterosaur hatchlings and larger members of their species dictate differences in wing ecomorphology and flight capabilities at different life stages, which might have bearing on pterosaur ontogenetic niching.

Static Bending Strength Analysis of the New Self-Healing Composite Gear Based on ANSYS

2013 ◽  
Vol 470 ◽  
pp. 376-380
Author(s):  
Li Zhang ◽  
Yan Miao Ma ◽  
Guang Yuan Nie
Keyword(s):  
3D Model ◽  
Bending Strength ◽  
The Self ◽  
Strength Analysis ◽  
Self Healing ◽  
Bending Stress ◽  
Short Glass Fiber ◽  
Glass Fiber Reinforced ◽  
Parameterized Modeling ◽  
Short Glass

A new kind of self-healing composite gear, namely the short glass fiber reinforced nylon 6 composite gear with 3.5wt% microcapsules, is studied in this paper. Its 3D model is built through the parameterized modeling function of Pro/E software, and then its stress distribution under a certain load is analyzed based on ANSYS, through which the maximum bending stress of the self-healing composite gears is obtained and the dangerous position is located. At the same time the same analysis is conducted on the composite material with no microcapsules. By comparing the analysis results of these two kinds of composite gears it shows that after adding 3.5wt% microcapsules the maximum bending stress of the composite gears decreased by 0.72% which can be seen basically unchanged, and their stress is almost in the same distribution with invariant dangerous position. The above result shows that the self-healing microcapsules have little influence on the static bending strength of composite gears.

Conventional and advanced bending strength analysis of common and castellated, homogeneous and hybrid I-beams

Stahlbau ◽  
2012 ◽  
Vol 81 (2) ◽  
pp. 142-150
Author(s):  
Jacek Chróścielewski ◽  
Zbigniew Cywiński ◽  
Arkadiusz Sitarski
Keyword(s):  
Bending Strength ◽  
Strength Analysis
Sign in / Sign up

Export Citation Format

Share Document