NUST Institutions Library Catalogue Search for 'kw,wrdl: (su-br:"Strength of Materials")'

Strength of Materials A New Unified Theory for 21st Century /

By Patnaik, Surya N.. Amsterdam ; | Boston : Elsevier/Butterworth-Heinemann, 2004 , "A new unified theory for the 21st century"--Cover. 0750674024 (alk. paper)

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Manufacturing Engineering and Technology /

By Kalpakjian, Serope,. Upper Saddle River, NJ : Prentice Hall, 2001 . xx, 1148 p. : 26 cm.. 0201361310

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Damage and Fracture Mechanics Failure Analysis of Engineering Materials and Structures /

Dordrecht, The Netherlands: Springer Verlag, 2009 9789048126682 (alk. paper)

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Manufacturing Engineering and Technology /

By Kalpakjian, Serope,. New York : Prentice Hall, 2010 . xxiv, 1176 p. : 26 cm.. 9788177581706

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Statics and strength of materials : a parallel approach to understanding structures /

By Wolf, Lawrence J.. Columbus, Ohio : Merrill, 1988 . xiv, 498 p. : 25 cm.. 0675206227

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Intermediate mechanics

By D.Humphrey. Boston : LongMans . . xiv, 438 p. : 24 cm.. 0072325194 (alk. paper)

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Introduction to mechanical properties of materials /

By Eisenstadt, Melvin M.. New York, Macmillan 1971 . 444p 0023321407

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What engineers do: engineering for everyman /

By Binger, Walter David,. New York, W. W. Norton & company, inc 1923 . xviii 304p

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Computational approaches to energy materials /

. xiv, 300 pages : 26 cm. 9781119950936 (hardback) | 1119950937 (hardback)

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Fundamentals of Materials Science and Engineering \ an integrated approach /

By Callister, William D.,. Hoboken, N.J. : Wiley, 2013 . xxv, 910 p. : , Includes index. 27 cm.. 9781118322697

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Preparation and Characterization of Pure Pla Filament and Pbat-Reinforced Pla Filament For Fdm 3d Printing /

By Naeem Ul Hassan. . 77p. , This study focuses on preparing pure polylactic acid (PLA) and polybutylene adipate –coterephthalate (PBAT)-reinforced PLA filaments. PLA and PBAT are biodegradable aliphatic polyesters and have recently received considerable attentions. Due to its brittle nature, PLA has limited application in various fields. To overcome this challenge, numerous efforts have been made to incorporate various additives to enhance its performance. In this work, pure PLA filament and PBAT-reinforced PLA filament with diameter 1.75 ± 0.02 mm were prepared in the lab. Their thermal and mechanical properties were analyzed and compared with the commercial PLA filament bought from the market. Following the previous research works and suggestions of incorporating no more than 10 wt.% PBAT, we have mixed 8 wt.% PBAT into the PLA mixture. We then proceeded to extrude pure PLA and PBAT-reinforced PLA filaments at a temperature range of 170 oC to 180 oC, utilizing single screw extruder. Next, we printed tensile and flexural specimens using an FDM 3D printer, in accordance with Taguchi L9 OA. Due to PBAT’s high ductility, 92-8 wt.% PLA-PBAT filament demonstrated a significant increase in elongation at break, reaching up to 12%. Likewise, the PLA-PBAT filament displayed tensile and flexural strengths of up to 48.34 MPa and 107.295 MPa respectively. These values are comparable to the tensile and flexural strengths of pure PLA, which is a great indication that the addition of 8 wt.% PBAT did not cause any unacceptable reduction in the tensile and flexural strengths. Additionally, it was found through DSC analysis that PLA-PBAT filament exhibited a higher degree of crystallinity (Xc) of up to 38.7%, which is significantly higher than that of pure extruded PLA. Furthermore, the TGA curve indicated that thermal stability of PLA-PBAT filament was improved by adding 8 wt.% PBAT. Moreover, digital microscopy results revealed that PLA-PBAT filament had a ductile fracture after necking, whereas pure PLA had a brittle fracture. Lastly, statistical analysis showed that both material type and layer thickness had significant impact on the results. The addition of this new PLA-PBAT filament provides an additional alternative to the current FDM filaments, and it will aid in reducing the constraints of the materials when it comes to additive manufacturing (AM) progress. 30cm.

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Effect of Hygrothermal Aging on Strength Performance of Cork Powder Reinforced Adhesive /

By Sohail, Zulekha . . 100p. , Adhesives play a crucial role across various industries and applications due to their ability to bond materials together. They are used in numerous ways, ranging from everyday household applications to industrial and specialized fields. Strength is the most critical factor to analyze before using the adhesive. Various techniques have already been developed and many are being developed to predict and improve the strength of adhesive. The addition of cork powder to the structural adhesives could improve the strength of adhesive joints through mechanical interlocking between the cork cells and the molecules of adhesive. However, even with the nanofiller reinforcement, the strength of adhesive joints is significantly affected by environmental parameters like temperature and humidity. The present study investigated the effect of hydrothermal aging on the strength characteristics of cork powder-reinforced adhesive samples. Reinforced adhesive samples were investigated under two different humidity levels of 80% and 100% RH. The cork powder will be added in concentration of 0.25wt.%, 0.5wt.%, 0.75wt.% and 1wt.% to study the reinforcing effects. The result shows that the saturated mass increased with increased in relative humidity that is approximately 0.4% and 0.9% for 80% and 100% RH respectively. The findings show that the ultimate tensile strength is reduced by the addition of cork powder as well as enhancing humidity. Furthermore, the addition of cork powder makes the sample more brittle, so failure strain and tensile toughness undergo decrement. The above finding indicated that hot-wet environment has a negative influence on strength performance of cork powder reinforced adhesive. In future the same study can be performed to know the strength of SLJ and DLJ to know its effect on joints. 30cm.

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Investigation of Impact Properties of Wave Springs Designed for Additive Manufacturing /

By Ahmed, Faizan . . 119p. , Innovation continues to transform various fields, including the design of springs. Initially helical springs were used as compression springs for most of the applications. However, the design innovation has led to the introduction of a new type of compression spring which is the wave spring. At the same time the advancements in manufacturing technologies are reshaping the production methods. Traditional manufacturing methods are gradually being replaced with additive manufacturing. Because AM has the ability to fabricate complex geometries with high precision and minimal material waste. These advantages make AM a key driver of innovation in modern design and engineering. Wave springs possess better mechanical properties as compared to helical springs, as highlighted by previous studies. But previous studies are limited to only compression analysis of wave springs at slow speeds. The behavior of this newly developed spring is unknown for sudden high speed impact loadings. This research involves the experimental and computational analysis of six different geometries of wave spring under the high speed loading conditions of 17mm/sec. The six geometries of wave springs are fabricated using FDM technology. PLA material was considered for the fabrication due to its availability and compatibility with the FDM. The other 2 materials including spring steel, and TPU (Thermoplastic Polyurethane) were used in computational modelling only. The results mainly showed that the material properties had a greater influence over the geometric parameters. PLA due to its brittle nature resulted in formation of local stresses that minimized the performance parameters of all geometries of wave springs. Spring steel having high elasticity and compressive strength showed better impact properties unlike PLA. TPU although elastic but moderate compressive strength was not able to show impact properties like spring steel, but due to its elasticity, it was a better choice over PLA. Each of the 6 geometries had different configurations that resulted in different local stress formations and thus different energy absorption, stiffness, and load-bearing capacity. To apply the concept of wave spring to real-engineering world, multiple wave spring designs were integrated in the car suspension system and analyzed on MSC Adams (Automated Dynamic Analysis of Mechanical Systems) for their energy absorption, stiffness, and maximum load bearing capacity. This analysis further validated the initial results and provided a gateway to the innovation in the car suspension system design and analysis. 30cm.

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Investigation and Optimization of Critical Response Variables in Wire Electrical Discharge Machining of SmCo₅ Magnetic Material /

By Mehmood, Adil . . 99p. , The magnetic alloys of samarium-cobalt SmCo₅ have been used in high-performance engineering as a result of their outstanding thermal stability and magnetic strength, but they are hard and brittle, which is a major challenge when trying to machine these using traditional machining methods. Wire Electrical Discharge Machining (WEDM) provides a practical approach to find a solution to shape such hard-to-machine materials, but a full picture of parameters and their response for SmCo₅ has not been established. The present study examines the effect of the essential parameters of the WEDM processes on the critical performance parameters, such as the kerf width, the surface roughness and the material removal rate (MRR), for machining of SmCo₅. An experimental design using Taguchi L18 array was used whereby the impacts of electrical, mechanical, and materialrelated factors were evaluated in a systematic manner and experimental trials were conducted. Analysis of Variance (ANOVA) achieved statistical analysis results that pulse on time is the primary determinant of kerf width via control of discharge energy, and pulse off time is the ultimate determinant of surface roughness safe through control of discharge stability and discharge cooling behavior. It was discovered that material removal was highly influenced by servo voltage because of the erosion behavior of the brittle magnetic alloy was not uniform. Multi-response optimization was conducted with the aid of the Weighted Sum Normalization, the Multi-Response Signal-to-Noise Ratio and the Grey Relational Analysis to handle the multiple machining objectives of conflicting nature. Of these, the Grey Relational Analysis had the best fit to the experimental results hence indicating better ability in the modeling of overall machining performance. 30cm.

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