Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"bolted joints"”.
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Nonlinear axial stiffness characteristics of axisymmetric bolted joints
… assessment of the current design theory for bolted joints which is based on a linear, one-dimensional stiffness analysis is presented. A detailed nonlinear finite element analysis of a bolted joint conforming to ANSI standards was performed. The finite element results arc presented in the …
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Parametric modeling of bolted joints between components made of particulate composite materials
… the stress distributions around the hole in a bolted joint made of particulate metal matrix composite and to investigate the associated load transfer efficiencies both for a single and double lap bolted joints. A three dimensional Finite Element parametric model has been developed to study the …
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Characterization of new particulate MMC materials and bolted joints through applicable ASTM standards
… to the above tests, a design for testing of bolted joints of MMC has been developed and implemented. Various parameters like clamping force, e/d ratio and w/d ratios are varied in order to investigate the effect on mode of failure and ultimate failure load of the MMC. It has been found that …
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Structural health monitoring of bolted joints using thermal contact resistance and ultrasonic signals
… been developed to ensure infrastructure safety. Bolted joints in most aerospace structures are useful components that enable easy assembly and disassembly for maintenance purposes. However, human workmanship engaged in the process of assembly makes an integrity check of the bolted joints a …
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Experimental study and numerical modelling of woven fabric kenaf fiber composites hybrid adhesively bonded-bolted joints
Couple with natural fiber composite parts, hybrid joints provide better joint strength than using separate joints. There are limited studies on structures response and strength prediction work on hybrid joints that limits its applicability. The aim of present study is to conduct experimental …
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Low cycle fatigue life improvements realized by reduced thermal strain due to flange separation in bolted joints
… challenging designs to model accurately is the bolted joint. Bolted joints are critical in aircraft engines as they connect parts and transfer loads. In complex joints, modeling can be difficult and is often simplified with the use of conservative assumptions. Recent commercial experience on …
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Development of a Self-Sensing and Self-Healing Bolted Joint
A self-sensing and self-healing bolted joint has been developed. This concept encompasses the areas of health monitoring, joint dynamics and smart materials. In order to detect looseness in a joint the impedance health monitoring method is used. A new method of making impedance measurements for …
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Constitutive Modeling of Friction in Bolted Connections
Bolted joints are ubiquitous in mechanical engineering, requiring accurate models to optimize designs. However, the exact nature of frictional contact between components is unknown and poses a significant challenge to modeling the nonlinear vibration of assemblies. This thesis applies empirical and …
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Order Reduction, Identification and Localization Studies of Dynamical Systems
… proposed to identify the dynamics of practical bolted joints. By modeling the difference between the dynamics of the bolted structure and the corresponding unbolted one, one constructs a nonparametric model for the joint dynamics. Two applications are given with a bolted beam and a truss joint …
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Reinforced Timber Laminated Veneer Lumber (LVL) Connection Loaded Perpendicular to the Grain
… the outcomes of a comprehensive study on how bolted timber connections with Laminated Veneer Lumber (LVL) respond to loading that is perpendicular to the grain. It investigates the topic in three main sections: understanding the stress-strain characteristic of LVL, checking how much splitting …
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CONTACT PRESSURE MEASUREMENT
The knowledge of the correct clamping force in a bolted joint is important in the prevention of leakage and in extending the life span of the joint. One of the methods to tighten the joints to the correct clamping force would be to use torque wrenches but this and other techniques do not indicate …
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Metodología para caracterizar materiales cfrtp, para su aplicación en elementos estructurales amortiguadores y anti-vibratorios de automoción
… dynamic properties required - Are suitable for bolted joints applications Samples made of CFRTP adhesived with vulcanized rubber were manufactured under the same conditions of current rubber-metal parts. The samples were tested under tensile and shear strength destructive tests in order to …
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Simultaneous machining of aerospace structural materials using poly-drills
… of holes are required to produce riveted and bolted joints in the assembly operation of the aircraft's structures. The major challenges which arise from the drilling of these alloys are characterized by the low hole quality, which might initiate cracks within the airframe structure and …
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Vibration- and Impedance-based Structural Health Monitoring Applications and Thermal Effects
… is also applied in monitoring the loosening of bolted joints in a full-scale railroad switch and the sensitivity of this technique to different levels of loosening of the bolts is investigated. The second part of the work presented here focuses on the analytical study and better understanding of …
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Multiscale physics-based modeling of friction
Frictional contacts between solids exist in nature and in a wide range of engineering applications. Friction causes energy loss, and it is the main source of wear and surface degradation which limits the lifetime of mechanical systems. Yet, friction is needed to walk, run, accelerate, slow down or …
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Structural assesment of joints in satellites using guided waves
… at the University of New Mexico using a simple bolted connection between two aluminum plates. Comparisons were made between wave energy transmission and a mechanical assessment of the joint rigidity. Results show a correlation between joint rigidity and energy transmission, demonstrating the …
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Determining the Influence of Experimental Setup and Inputs on Nonlinear Systems
In the automotive and aerospace industries, every component experiences dynamic loading. The complex, multi-axial loads and surrounding system are the environmental conditions. Due to the lack of understanding of nonlinear system dynamics, the components and structures have been over-designed to …