scholarly journals Research on performance of rigid-hoop-reinforced multi-DOF soft actuator

2021 ◽  
Vol 13 (6) ◽  
pp. 168781402110267
Author(s):  
Jin Sun ◽  
Daozhou Zhang ◽  
Yang Zhang ◽  
Xinglong Zhu ◽  
Juntong Xi ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Silicone Rubber ◽  
Spring Steel ◽  
High Load ◽  
The Body ◽  
Load Carrying Capacity ◽  
Bending Angle ◽  
Soft Actuator ◽  
Load Carrying ◽  
Soft Actuators

In order to improve the bearing capacity of soft actuators, this article presents the development of the rigid-hoop-reinforced (spring or steel hoop) multi-DOF soft actuator. The actuator is composed of a rotary module with spring reinforcement on the silicone rubber-based body and a bending module with steel hoop reinforcement on the body. Compared with fiber-reinforced actuators, the bearing capacities of rigid-hoop-reinforced actuators made of 65Mn spring steel are improved. The radial and the axial bearing capacity for the bending module and the rotary module is raised by 29.6%, 28.2%, 30.6%, 49.6% respectively; under the same pressure, the spring-reinforced interval increases the maximum rotary angle of the rotary module, the steel hoop-reinforced interval increases the maximum bending angle of the bending module; with the same reinforcement type, the bending module with reinforcement interval of 10 mm has good bending characteristics that the bending angle changes with the pressure gently; the lower the hardness of silicone rubber base body, the better the adaptability and flexibility of the actuator, and the higher the hardness, the greater the bearing capacity of the actuator. Due to the above advantages, the rigid-hoop-reinforced multi-DOF soft actuator can be applied to medical devices which need high load-carrying capacity.

scholarly journals Load-carrying capacity of welded K-type joints inside floor truss systems

2019 ◽  
Vol 52 (1) ◽  
pp. 38-52
Author(s):  
Pooya Saremi ◽  
Wei Lu ◽  
Jari Puttonen ◽  
Dan Pada ◽  
Jyrki Kesti
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Carrying Capacity ◽  
Numerical Models ◽  
High Load ◽  
Load Carrying Capacity ◽  
Finite Element Analyses ◽  
Load Bearing Capacity ◽  
Load Carrying ◽  
Joint Behaviour

The load-carrying capacity of a K-type joint inside a floor truss is studied both experimentally and numerically. The joint tested is a scaled-down, isolated joint. The tubular braces, plate chord, and division plate are made of SSAB Domex steel. Comparison of load displacement curves received by finite element analyses with curves obtained from tests confirms that numerical models describe joint behaviour reasonable. The paper demonstrates that joints with high load-bearing capacity can be investigated experimentally by scaling the dimensions of the joint down when testing devices can affect the required capacity of the joint. The results presented can also be used for optimizing failure mechanism of similar joints in practice.

Performance study of RTV-2 Silicone Rubber Material For Soft Actuator by Experimental and Numerical methods: The Effect of Inflation Pressure and Wall Thickness

2020 ◽  
Vol 17 (1) ◽  
pp. 7524-7532 ◽  
Author(s):  
Deepak D. ◽  
Nitesh Kumar ◽  
Shreyas P. Shetty ◽  
Saurabh Jain ◽  
Manoj Bhat
Keyword(s):  
Numerical Methods ◽  
Wall Thickness ◽  
Silicone Rubber ◽  
Inflation Pressure ◽  
Performance Study ◽  
Rubber Material ◽  
Soft Actuator ◽  
Alternative Materials ◽  
Load Carrying ◽  
Influential Parameters

The expensive nature of currently used materials in the soft robotic industry demands the consideration of alternative materials for fabrication. This work investigates the performance of RTV-2 grade silicone rubber for fabrication of a soft actuator. Initially, a cylindrical actuator is fabricated using this material and its performance is experimentally assessed for different pressures. Further, parametric variations of the effect of wall thickness and inflation pressure are studied by numerical methods. Results show that, both wall thickness and inflation pressure are influential parameters which affect the elongation behaviour of the actuator. Thin (1.5 mm) sectioned actuators produced 76.97% more elongation compared to thick sectioned, but the stress induced is 89.61 % higher. Whereas, the thick sectioned actuator (6 mm) showed a higher load transmitting capability. With change in wall thickness from 1.5 mm to 6 mm, the elongation is reduced by 76.97 %, 38.35 %, 21.05 % and 11.43 % at pressure 100 kPa, 75 kPa, 50 kPa and 25 kPa respectively. The induced stress is also found reduced by 89.61 %, 86.66 %, 84.46 % and 68.68 % at these pressures. The average load carrying capacity of the actuator is found to be directly proportional to its wall thickness and inflation pressure.

Ga-based liquid metal with good self-lubricity and high load-carrying capacity

2019 ◽  
Vol 129 ◽  
pp. 1-4 ◽  
Author(s):  
Jun Cheng ◽  
Yuan Yu ◽  
Jie Guo ◽  
Shuai Wang ◽  
Shengyu Zhu ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Carrying Capacity ◽  
High Load ◽  
Load Carrying Capacity ◽  
Load Carrying

A novel prosthetic finger design with high load-carrying capacity

2021 ◽  
Vol 156 ◽  
pp. 104121
Author(s):  
S. Liu ◽  
M. Van ◽  
Z. Chen ◽  
J. Angeles ◽  
C. Chen
Keyword(s):  
Carrying Capacity ◽  
High Load ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Prosthetic Finger

NDE Inspections and Simulation of Defects in Composite-Sintered Bushes

2013 ◽  
Vol 650 ◽  
pp. 582-587
Author(s):  
Kwang Hee Im ◽  
Ki Youl Kim ◽  
Ki Taek Shin ◽  
Han Hee Lee ◽  
To Kang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Carrying Capacity ◽  
Diffusion Bonding ◽  
Manufacturing Process ◽  
High Load ◽  
Load Carrying Capacity ◽  
Heavy Duty ◽  
Temperature Diffusion ◽  
Load Carrying

Bush is one of machine and automobile parts like brake used in drums and hubs in particular. Such bush parts are used for bearings of heavy-duty, large cars requiring wear resistance and high load carrying capacity. High temperature diffusion bonding has been applied for holding the both materials of the bushing together, which are outer steel materials and inner composite-sintered bushings. Therefore, it is very important evaluate the bonding integrity in manufacturing process. A simulation has been performed in order to evaluate the maximum defect sizes. Also, ultrasonic C-scan tests were performed for finding the defect in the composite-sintered bushings with the size of inherent flaws.

scholarly journals The Effect of Load Carrying Capacity of Pile-response Under Subsequent Loading for Rotary-Jacking Pile

2018 ◽  
Vol 65 ◽  
pp. 06002
Author(s):  
Nor Syamira Hassan ◽  
Aniza Ibrahim
Keyword(s):  
Bearing Capacity ◽  
Construction Industry ◽  
New Method ◽  
Silica Sand ◽  
Load Carrying Capacity ◽  
Pile Installation ◽  
Innovative Method ◽  
Load Carrying ◽  
Large Container ◽  
Pile Response

Pile jacking process can lead to high bearing capacity, stiff base response but sometimes excessive installation resistance. However, it limited by jack capacity and negative shaft resistance. To overcome some of the above problems and to improve the pile performance, rotary jacking of the pile is used. It can alleviate installation problems and bearing capacity is activated during subsequent loading. Therefore, the objective of this research is to investigate the behavior of pile using this new innovative technique. A 25 mm circular fabricated steel pile was used for the experiments The experiments were done in the laboratory using a large container filled with silica sand, and the rotary and jacking method was tested with few series of cases. Results show that this new method of pile installation is successfully obtained and acceptable. This new method of pile installation is an innovative method to be used for the future in the construction industry.

scholarly journals Effectiveness of Geogrids on Rutting and Bearing Capacity of Sub-base Course

2015 ◽  
Vol 15 (1) ◽  
pp. 77-80
Author(s):  
Ali Reza Mardookhpour
Keyword(s):  
Bearing Capacity ◽  
Soil Mechanics ◽  
Research Work ◽  
Polymer Materials ◽  
Load Carrying Capacity ◽  
Highway Projects ◽  
Load Carrying ◽  
Two Factors ◽  
Base Course ◽  
Increasing Load

Geogrids are being used in transportation application often in embankment construction due to their ease of construction and economy compared to traditional methods. Utilizing polymer materials in order to improve the performance of road structure is based on two factors, decreasing deformation and increasing bearing capacity. In this study geogrids were tested to check the ability of increasing load carrying capacity for highway projects. The purpose of this research work was to find a relation between the loading of the geogrid, the thickness of the aggregate layer and its bearing capacity. This would normally lead to an investigation on the lateral restrain behavior of a geogrid. According to the results obtained from soil mechanics laboratory, it could be demonstrated that by utilizing geogrids , the probability of occurring rutting decreases 30% and the bearing capacity of soil increase 40 % respectively.DOI: http://dx.doi.org/10.3126/njst.v15i1.12020  Nepal Journal of Science and TechnologyVol. 15, No.1 (2014) 77-80

Wind System Reliability and Capacity

2014 ◽  
Author(s):  
Alex Pavlak ◽  
Harry V. Winsor
Keyword(s):  
Power Systems ◽  
Carrying Capacity ◽  
System Reliability ◽  
Electric Power Systems ◽  
High Load ◽  
System Capacity ◽  
Wind Generation ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Superior Approach

Capacity measures a system’s ability to survive stress. For example, structures are engineered in part to have the capacity to survive the worst wind loads expected over the life of the structure. Likewise wind electric power systems should have the capacity to reliably survive the worst combination of high load and low wind. A superior approach for quantifying wind’s contribution to system capacity is well known. It is to view wind as a negative load and use the Effective Load Carrying Capacity (ELCC) methodology for a given year. A frequent mistake is to average these annual ELCC estimates. A main contribution of this paper is to explain why the system design criteria should take the worst of the annual ELCC estimates over a number of years and not an average of annual ELCC estimates. Based on extreme events, wind generation contributes little to system capacity (<6.6% of wind nameplate). The empirical evidence shows that wind generation is an energy source, not a capacity resource.

Load-Carrying Capacities of Fully Clamped RC Slab Accompanying Compressive-Tensile Membrane Actions: A Theoretical Approach

2020 ◽  
Vol 20 (08) ◽  
pp. 2050094
Author(s):  
Wanxiang Chen ◽  
Lisheng Luo ◽  
Zhikun Guo ◽  
Yingjie Wang
Keyword(s):  
Bearing Capacity ◽  
Carrying Capacity ◽  
Flexural Rigidity ◽  
Load Carrying Capacity ◽  
Membrane Action ◽  
Yield Line ◽  
Load Carrying ◽  
Membrane Effects ◽  
Rc Slab ◽  
Rc Slabs

Fully clamped reinforced concrete (RC) slab is a common structural component possessing better load-carrying capacity over simply supported slab. Currently, typical yield line theory is a popular approach to estimate the bearing capacity of fully clamped RC slab, although it would greatly underestimate the actual ultimate resistance. This paper is devoted to enriching the knowledge of membrane action and its contribution to the load-carrying capacity of the clamped slab. The resistance trajectory of fully clamped RC slab from loading to failure undergoes three phases: the ascending branch raised by outward movement prevention, the descending branch due to crushed concrete and the re-ascending branch caused by reinforcement strain. Applied load–deflection curves of RC slab accompanying compressive-membrane actions are achieved according to the bending theory of normal cross-section. The reserve capacities accompanying tensile-membrane actions in the condition of large deformations are further derived. The whole load–deflection curves that considered compressive-tensile membrane effects are finally presented, where the mid-span displacements are revised by the deflection equations and the softening coefficient of flexural rigidity. It is indicated that the load–deflection relationships of fully clamped RC slabs can be reasonably depicted by taking compressive-tensile membrane effects into account, which are fairly different from yield line approaches. Comparative analysis shows that analytical results are in good agreement with experimental data reported by Park et al. and illustrates that the proposed model is capable of predicting the bearing capacity of fully clamped RC slab with very good accuracy.

scholarly journals Increasing the load carrying capacity of highly loaded gears by nitriding

2019 ◽  
Vol 287 ◽  
pp. 02001 ◽  
Author(s):  
Johannes Koenig ◽  
Stefanie Hoja ◽  
Thomas Tobie ◽  
Franz Hoffmann ◽  
Karsten Stahl
Keyword(s):  
Carrying Capacity ◽  
High Sensitivity ◽  
Compound Layer ◽  
High Load ◽  
Load Carrying Capacity ◽  
Stable Compound ◽  
Current State ◽  
Load Carrying ◽  
State Of Research ◽  
Highly Loaded

Nitriding is a common heat treatment process for highly loaded gears. A very hard compound layer with a thickness of a few microns is produced at the surface of the gear. In the underlying material areas, a diffusion layer with nitride precipitations is formed. This publication summarizes the state of knowledge of nitrided gears and gives an overview of the current state of research in the field of nitrided gears. It can be concluded that a high load carrying capacity of nitrided gears is dependent on an adequate NHD and a stable compound layer. However, due to the increased surface roughness after nitriding, the risk of micropitting increases, too. Therefore, it may be favourable to grind the gears after nitriding. Ground gears also can provide a high load carrying capacity, but it must be taken into account that the wear performance will decrease significantly, since it is mainly influenced by the compound layer. In addition, nitrided gears usually show a high sensitivity against local load peaks. Beyond creating a stable compound the layer, the realization of a sufficient nitriding hardness depth with larger gear sizes is a focus in the current field of research.

Sign in / Sign up

Export Citation Format

Share Document