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Modeling of High Strength and Wear Resistance Alumi

Thesis Info

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Author

Hayat, Jokhio Muhammad

Program

PhD

Institute

Mehran University of Engineering and Technology

City

Jamshoro

Province

Sindh

Country

Pakistan

Thesis Completing Year

2010

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/1306

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726657445

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Modeling of high strength and wear resistance aluminum alloy based casting of composite material developed via conventional foundry method which is one of the most economical versatile and active research area and so for has not been thoroughly investigated. Due to complex nature of the composite materials and their related problems such as the nonlinear relationship between composition, processing parameters, heat treatment with the strength and abrasive wear, resistance can more efficiently be modeled by artificial neural networks. The artificial neural networks modeling requires sufficient data concerned with chemical composition , processing parameters and the resulting mechanical properties which were not available for such type of modeling. Therefore, a wide range of experimental work was conducted for the development of aluminum composites using conventional foundry method. Alloy containing Cu-Mg- Zn as matrix and reinforced with 1- 15 % Al 2 O 3 particles were prepared using stir casting method. The molten alloys composites were cast in metal mold. More than eighty standard samples were prepared for tensile tests and sixty samples were given solution treatment at 580 0 C for 1⁄2 hour and tempered at 120 0 C for 24 hours. Various characterization techniques apparatus such as X-ray Spectrometer, Scanning Electron Microscope, Optical Metallurgical Microscope, Universal Tensile Testing Machine, Vickers Hardness and Abrasive Wear Testing Machine were used to investigate the chemical composition, microstructural features, density, tensile strength, ductility (elongation), hardness and abrasive wear resistance. xixThese investigations including the material development and characterization were used for data generations as needed for modeling of high strength and abrasive wear résistance aluminum cast composites. For modeling purpose a multilayer perceptron (MLP) feedforward was developed and back propagation learning algorithm was used for training, testing and validation of the model. The modeling results shows that an architecture of 14 inputs with 9 hidden neurons and 4 outputs which include the tensile strength, elongation, hardness and abrasive wear resistance gives reasonably accurate results with an error within the range of 2-7 % in training, testing and validation. The modeling results shows that an alloy contents 2-3 % Cu, 2-3 % Mg, 3-5 % Zn reinforced with 10 % Al 2 O 3 can successfully be developed for highest strength (297 MPa) and highest abrasive wear résistance (0.4 gm weight loss /15 minutes using stir casting method. The modeling results also suggest that it is possible to develop the highest strength 466 MPa tensile strength and highest abrasive wear resistance aluminum alloy based casting composite materials having the matrix composition of 6 % Si, 2 % Mg with 3 % Zn reinforced with 2-5 % Al 2 O 3 particles.
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ڈاکٹر طہ حسین

ڈاکٹر طہٰ حسین
افسوس ہے پچھلے دنوں عالمِ اسلام کی دو بلند پایہ اور نامور شخصیتیں ہم سے جُدا ہوگئیں، اوریہ دونوں مصری تھیں، ایک ڈاکٹر طہٰ حسین اوردوسرے شیخ ابوزہرہ۔اول الذکر بچپن میں ہی نابینا ہوگئے تھے لیکن اس کے باوجود علم وفضل اور ادب وانشاء میں وہ کمال پیدا کیا کہ نہ صرف مصرکے بلکہ مشرق کی ایک نامور شخصیت بن گئے۔ انھوں نے جامعۂ ازہر قاہرہ یونیورسٹی اورپھر فرانس میں تعلیم حاصل کی تھی، اس بناء پروہ کلاسکل اورجدید دونوں ادبیات کے مبصر اورصاحبِ فن نقاد تھے، ایک زمانہ میں پروفیسر مارگولیوتھ کی ہمنوائی میں انھوں نے اشعر الجاہلی کے نام سے جوکتاب لکھی تھی اس پر مصر میں ان کے خلاف اس قدر شدید ہنگامے ہوئے کہ لوگوں نے ان کاسوشل بائیکاٹ کردیا اور گورنمنٹ نے بھی کتاب کی اشاعت ممنوع قراردے دی۔اس کے بعد ڈاکٹر طہٰ حسین نے قابلِ اعتراض حصّہ کوخارج کرکے اسی کتاب کو الادب الجاہلی کے نام سے شائع کیا، اس کے علاوہ اورمتعدد کتب ، مثلاً حدیث الاربعاء تین جلدوں میں، علی ہامش السیرۃ، الشیخان، الفتنۃ الکبری، مراۃ الاسلام، الایام، وغیرہ مرحوم کی یادگار ہیں۔ لیکن ان کا اصل میدان ادبی تنقید تھا۔علاوہ ازیں وہ ایک خاص طرزِ تحریر کے بانی اور موجد تھے جس میں نسیم سحر کی لطافت، دریا کی روانی شعلہ کی لپک اورسیلِ رواں کی طاقت سب گھل مل گئے ہیں۔عرب کی نئی نسل کے ذہن اور فکر پرڈاکٹر طہٰ حسین کے قلم کے بہت گہرے اثرات ہیں اوراس حیثیت سے وہ بے شبہ عہدِ جدید کے ادبی معماروں میں ایک ممتاز مرتبہ ومقام کے مالک ہیں۔
[مئی ۱۹۷۴ء]

 

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