Experimental investigation on the self-ignition of pressurized hydrogen released by the failure of a rupture disk through tubes

An experimental investigation was conducted to study the effects of clamped length and loading direction on the self-loosening behavior of bolted joints. Specially designed fixtures were used for the study. The experiments mimicked two plates jointed by an M12×1.75 Class 10.9 bolt and a nut. The joints were subjected to cyclic external loading. A constant preload of 25 kN was used for all the experiments conducted. During an experiment, the relative displacement between the two clamped plates, δ, was a controlling parameter. The reduction in clamping force, the applied transverse load, and the nut rotation were measured cycle by cycle. The relationship between, Δδ/2, the amplitude of the relative displacement between the two clamped plates, and, NL, the number of loading cycles to loosening is referred to as self-loosening curve and was obtained for different clamped lengths and applied load directions. Similar to a fatigue curve, an endurance limit can be identified from the self-loosening curve. It was found that increasing the clamped length can enhance the self-loosening endurance limits in terms of the controlled relative displacement of the two clamped plates. However, the load carrying capability was not influenced significantly due to the thickness of the clamped plates. For a given bolted jointed structure, an angle of the external load from the pure shearing direction resulted in an increase in self-loosening resistance.

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Numerical and experimental investigation of the self-inducing turbine aeration capacity

Energy Conversion and Management ◽

10.1016/j.enconman.2014.03.081 ◽

2014 ◽

Vol 83 ◽

pp. 188-196 ◽

Cited By ~ 2

Author(s):

Ryma Achouri ◽

Hatem Dhaouadi ◽

Hatem Mhiri ◽

Philippe Bournot

Keyword(s):

Experimental Investigation ◽

The Self ◽

Aeration Capacity

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Experimental investigation of the self-action of acoustic waves in systems with dissipative nonlinearity

Acoustical Physics ◽

10.1134/1.1418902 ◽

2001 ◽

Vol 47 (6) ◽

pp. 733-738 ◽

Cited By ~ 3

Author(s):

V. E. Nazarov ◽

A. V. Radostin ◽

Yu. A. Stepanyants

Keyword(s):

Experimental Investigation ◽

Acoustic Waves ◽

The Self ◽

Dissipative Nonlinearity

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An Experimental Investigation of the Effects of Clamped Length and Loading Direction on Self-Loosening of Bolted Joints

Journal of Pressure Vessel Technology ◽

10.1115/1.2217972 ◽

2005 ◽

Vol 128 (3) ◽

pp. 388-393 ◽

Cited By ~ 8

Author(s):

Ming Zhang ◽

Yanyao Jiang ◽

Chu-Hwa Lee

Keyword(s):

Experimental Investigation ◽

Fatigue Curve ◽

Relative Displacement ◽

The Self ◽

Bolted Joints ◽

Transverse Load ◽

External Loading ◽

Loading Direction ◽

Controlling Parameter ◽

Load Carrying

An experimental investigation was conducted to study the effects of clamped length and loading direction on the self-loosening behavior of bolted joints by using specially designed fixtures. The experiments mimicked two plates jointed by an M12×1.75 class 10.9 bolt and a nut. The joints were subjected to cyclic external loading. A constant preload of 25kN was used for all the experiments conducted. During an experiment, the relative displacement between the two clamped plates, δ, was a controlling parameter. The reduction in clamping force, the applied transverse load, and the nut rotation were measured cycle by cycle. The relationship between, Δδ∕2, the amplitude of the relative displacement between the two clamped plates, and, NL, the number of loading cycles to loosening is referred to as self-loosening curve and was obtained for different clamped lengths and applied load directions. Similar to a fatigue curve, an endurance limit can be identified from the self-loosening curve. It was found that increasing the clamped length can enhance the self-loosening endurance limits in terms of the controlled relative displacement of the two clamped plates. However, the load carrying capability was not influenced significantly due to the thickness of the clamped plates. For a given bolted jointed structure, an angle of the external load from the pure shearing direction resulted in an increase in self-loosening resistance.

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Experimental investigation of commercial small diameter dental implants in porcine mandibular segments

Biomedical Engineering / Biomedizinische Technik ◽

10.1515/bmt-2015-0161 ◽

2017 ◽

Vol 62 (1) ◽

Author(s):

Istabrak Hasan ◽

Friedhelm Heinemann ◽

Monika Schwegmann ◽

Ludger Keilig ◽

Helmut Stark ◽

...

Keyword(s):

Experimental Investigation ◽

Dental Implants ◽

Small Diameter ◽

Primary Stability ◽

The Self ◽

Immediate Loading ◽

Mini Implants ◽

Scientific Analysis ◽

Loading System ◽

Implant Treatment

AbstractSmall diameter (mini) dental implants have become more popular in recent years as alternatives to classical implant treatment in clinical cases with critical bony situations. However, an in-depth scientific analysis of the mechanical and biomechanical effects of small diameter implants has not yet been published. The aim of the present study was to investigate experimentally different commercial mini implants by measuring their displacements under immediate loading. Twelve commercially available mini implants were measured. Implants were inserted into porcine mandibular segments and loaded by means of a predefined displacement of 0.5 mm of the loading system. The implants were loaded at an angle of 30° to the implant long axis using the self-developed biomechanical hexapod measurement system. Implant displacements were registered. The experimental results were compared to the numerical ones from a previous study. Measured implant displacements were within the range of 39–194 μm. A large variation in the displacements was obtained among the different implant systems due to the different designs and thread profiles. Comparing experimental and numerical results, the displacements that were obtained numerically were within the range of 79–347 μm. The different commercial mini implants showed acceptable primary stability and could be loaded immediately after their insertion.

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