Hydrostatic Force Sensor for Robotic Applications

1997 ◽  
Vol 119 (1) ◽  
pp. 115-119 ◽  
Author(s):  
H. Kazerooni ◽  
Mark S. Evans ◽  
J. Jones
Keyword(s):  
Experimental Investigation ◽  
Strain Gage ◽  
Failure Modes ◽  
Force Sensor ◽  
Pressure Change ◽  
Theoretical Derivation ◽  
Mathematical Expressions ◽  
Hydrostatic Force ◽  
Tensile Forces ◽  
Robotic Applications

This article presents a theoretical and experimental investigation of a new kind of force sensor which detects forces by measuring an induced pressure change in a material of large Poisson’s ratio. In this investigation, we develop mathematical expressions for the sensor’s sensitivity and bandwidth, and show that its sensitivity can be much larger and its bandwidth is usually smaller than those of existing strain-gage-type sensors. This force sensor is well-suited for measuring large but slowly varying forces. It can be installed in a space smaller than that required for existing sensors. This paper also discusses the effects of various parameters on the sensor’s performance and on failure modes. To verify the theoretical derivation, a prototype force sensor was designed and built. This prototype hydrostatic force sensor can measure the compressive forces up to 7200 lbf and tensile forces up to 3500 lbf.

scholarly journals Buckling behavior of cold-formed steel columns at both ambient temperature and simulated fire conditions

Fire Research ◽  
2016 ◽  
Author(s):  
Hélder D. Craveiro ◽  
João Paulo C. Rodrigues ◽  
Luís M. Laím
Keyword(s):  
Experimental Investigation ◽  
Ambient Temperature ◽  
Cross Sections ◽  
Failure Modes ◽  
Steel Columns ◽  
Buckling Behavior ◽  
Wide Range ◽  
Cold Formed Steel ◽  
Simulated Fire ◽  
Fire Conditions

Cold-formed steel (CFS) profiles with a wide range of cross-section shapes are commonly used in building construction industry. Nowadays several cross-sections can be built using the available standard single sections (C, U, Σ, etc.), namely open built-up and closed built-up cross-sections. This paper reports an extensive experimental investigation on the behavior of single and built-up cold-formed steel columns at both ambient and simulated fire conditions considering the effect of restraint to thermal elongation. The buckling behavior, ultimate loads and failure modes, of different types of CFS columns at both ambient and simulated fire conditions with restraint to thermal elongation, are presented and compared. Regarding the buckling tests at ambient temperature it was observed that the use of built-up cross-sections ensures significantly higher values of buckling loads. Especially for the built-up cross-sections the failure modes were characterized by the interaction of individual buckling modes, namely flexural about the minor axis, distortional and local buckling. Regarding the fire tests, it is clear that the same levels of restraint used in the experimental investigation induce different rates in the generated restraining forces due to thermal elongation of the columns. Another conclusion that can be drawn from the results is that by increasing the level of restraint to thermal elongation the failure of the columns is controlled by the generated restraining forces, whereas for lower levels of restraint the temperature plays a more important role. Hence, higher levels of imposed restraint to thermal elongation will lead to higher values of generated restraining forces and eventually to lower values of critical temperature and time.

scholarly journals Fault Analysis of a Gas Turbine HTGR

1976 ◽  
Author(s):  
R. Chmielewski ◽  
K. Vepa ◽  
L. Cheng ◽  
J. Bowyer
Keyword(s):  
Gas Turbine ◽  
Failure Modes ◽  
Pressure Ratio ◽  
Power Conversion ◽  
Reactor Core ◽  
Pressure Change ◽  
Fault Analysis ◽  
Preliminary Evaluation ◽  
Design Considerations ◽  
Disk Failures

The Gas Turbine High Temperature Gas-Cooled Reactor combines a helium-cooled reactor core of established design with a closed-cycle helium turbine power-conversion system. This paper discusses the design considerations which mitigate the consequences of failure of the rotating machinery located within the reactor vessel. The methods of analysis and summary of results are presented for the failure modes of most concern. The spectrum of potential incidents which have been evaluated include turbine blade, rim, and disk failures. The requirements and design methods for rotor containment are discussed. The turbomachine maintains a pressure ratio of about two between the high and low pressure portions of the loop; postulated failures can, therefore, lead to rapid rates of pressure change. The preliminary evaluation of this internal pressure equilibration is presented.

Experimental investigation on the bending and buckling behavior of bio-based core innovative sandwich panels

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Abdelmadjid Si Salem ◽  
Fatma Taouche-Kkheloui ◽  
Kamal Ait Tahar
Keyword(s):  
Experimental Investigation ◽  
Failure Modes ◽  
Raw Materials ◽  
Sandwich Panels ◽  
Test Results ◽  
Content Type ◽  
Reinforced Polymer ◽  
Buckling Behavior ◽  
Experimental Values ◽  
Original Information

PurposeThe present study aims to experimentally investigate the flexural and buckling performances of novel sandwich panels manufactured with sawdust-based modified mortar core and both polypropylene and reinforced polymer plates as skins.Design/methodology/approachThe experimental investigation includes two main steps, characterization tests were firstly carried out in order to identify the laws behavior of the constitutive raw materials. The second one investigates 42 sandwich panels tested under three-points bending and buckling according to standard norms.FindingsThe emphasized test results in terms of bearing capacity; buckling strength, ductility, and failure mechanisms confirm that the overall and observed behavior of tested eco-friendly panels was in general satisfactory compared with experimental values reported in the literature. Indeed, the failure modes under bending and buckling conditions were summarized as shear/crimping failure of the sawdust-based mortar core without debonding of the core–skins interface.Originality/valueThe paper provides original information about the development of novel sandwich panels with a bio-based core and polymer skins for construction usage as interior partitioning walls.

Design and experimental investigation on 3- component force sensor in mini CNC milling machine

2019 ◽  
Vol 17 ◽  
pp. 1931-1938
Author(s):  
Worrawat Lapsomthop ◽  
Nattapol Wongsirirax ◽  
Adithep kititeerakol ◽  
Worapong Sawangsri
Keyword(s):  
Experimental Investigation ◽  
Force Sensor ◽  
Milling Machine ◽  
Cnc Milling ◽  
Cnc Milling Machine ◽  
Component Force

Experimental Investigation of Energy Absorption of ‎Partially Wrapped Thin-Walled ‎Aluminium-Glass/Epoxy Tube Subjected to Quasi-Static Loading

2017 ◽  
Vol 904 ◽  
pp. 61-67
Author(s):  
Tahir Abbas ◽  
Hamdan H. Ya ◽  
Mohamad Zaki Abdullah
Keyword(s):  
Experimental Investigation ◽  
Energy Absorption ◽  
Fiber Orientation ◽  
Static Loading ◽  
Failure Modes ◽  
Testing Machine ◽  
Filament Winding ◽  
Universal Testing ◽  
Thin Walled ◽  
Filament Winding Process

This paper describes the failure modes and energy absorption capability of partially wrapped aluminium-glass/epoxy tubes, subjected to quasi-static loading. ‎These tubes are used in aircraft and automobiles applications. Aluminium tubes were partially wrapped with 4, 6 and 8 glass/epoxy layers, using filament winding process. The 90◦ fiber orientation was used for glass/epoxy layers. Quasi-static loading of partially wrapped tubes was carried out at 5mm/min speed, using the universal ‎testing machine. The experimental results revealed that partially wrapped aluminium tubes are 42.54%, 47.77% and 28.91% more ‎efficient in energy absorption as compared to the simple aluminium tubes. Furthermore, the effect of glass/epoxy layers on ‎failure modes has also been described.

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