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Effect of Structural Dynamics Characteristics on Damage Tolerance of Crabon Fiber Sandwich Panels

Thesis Info

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Author

Waqas Anwar

Program

PhD

Institute

Institute of Space Technology

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2018

Thesis Completion Status

Completed

Subject

Mechanical Engineering

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/10832/1/Waqas%20Anwar_Mechanical%20Engg_2018_IST_PRR.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727742693

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The use of composite materials is rapidly growing in the construction of aerospace structures. Most of the aircraft parts made from composite materials, like wing skins, spoilers, fairings, and flight controls, are being used due to their reduced weight as compared to aluminum parts. New generation large commercial aircraft are being designed with all composite fuselage and wing structure. The main advantages of composites over conventional metallic materials are their high strength to weight ratio, corrosion resistance and tailored stiffness. Uni-directional composites have predominant mechanical properties in one direction and vary with the direction relative to the axis of structure. The aero-elastic properties, such as stiffness and dynamic stability, also depend on the stacking sequence of the plies. Fatigue and Damage Tolerance (F&DT) assessment of these advanced composite materials is an emerging field of research. In aircraft structural integrity analysis, the damage tolerance and fatigue life is investigated against a cyclic loading spectrum. The particular spectrum includes the stress/loading levels counted during a flight of certain duration. The occurrences of z-axis load factors ‘Nz’ may include higher gravitational acceleration ‘g’ levels. While maintaining a certain g level occurrence at higher angle of attack, wing structure vibrates with the amplitudes of its natural frequencies. The cyclic stress amplitudes of vibration depend upon the natural frequencies of vibrating structure, i.e. lower frequency gives higher amplitudes and vice versa. These fluctuating load amplitudes are superimposed on the higher ‘g’ level mean loads during fatigue analysis. These additional cycles are very critical in DTA studies.
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مولانا سلیمان اشرف

مولانا سید محمد سلیمان اشرف
چار سلیمانوں کی رباعی قاضی محمد سلیمان صاحب مصنف رحمتہ للعالمین کی وفات سے مثلث ہوگئی تھی، شاہ سلیمان صاحب پھلواروی کی رحلت سے وہ فرد بن گئی تھی، اب اخیر اپریل ۱۹۳۹؁ء میں مولانا سلیمان اشرف صاحب (استاذ دینیات مسلم یونیورسٹی) کی موت سے مصرع ہوکر رہ گئی، دیکھنا یہ ہے کہ یہ مصرع بھی دنیا کی زبان پر کب تک رہتاہے۔
بہت آگے گئے باقی جو ہیں تیار بیٹھے ہیں
مولانا سید محمد سلیمان اشرف صاحب مرحوم بہار کے ایک مردم خیز دیہات کے رہنے والے اور شرفائے سادات کے خاندان سے تھے، ان کے والد مرحوم حکیم عبداﷲ صاحب اور ان کے اعمامِ محترم مولانا عبدالقادر صاحب، مولوی عبدالرزاق صاحب، مولوی عبدالغنی صاحب و مولانا عبید اﷲ صاحب اہل علم و فقر تھے، مولانا مرحوم نے درس کا بڑا حصہ مولانا محمد احسن صاحب استھانوی بہاری سے حاصل کیا تھا اور کچھ دن دارالعلوم ندوہ میں بسر کئے تھے، اور آخر میں مظق و فلسفہ کی آخری کتابیں مولانا ہدایت اﷲ خان صاحب رامپوری ثم الجونپوری سے پڑھی تھیں، جو یورپ میں خیر آبادی سلسلہ کے خاتم تھے، مولانا سید سلیمان اشرف صاحب مرحوم کو حقیقت یہ ہے کہ اپنے استاد کے ساتھ عقیدت ہی نہیں، بلکہ عشق تھا، ان کے حالات وہ جب کبھی سناتے تھے، تو ان کے طرز بیان گفتار کی ہراد اسے ان کی والہانہ عقیدت تراوش کرتی تھی۔
مرحوم خوش اندام، خوش لباس، خوش طبع، نظافت پسند، سادہ مزاج اور بے تکلف تھے، ان کی سب سے بڑی خوبی ان کی خودداری اور اپنی عزت نفس کا احساس تھا، ان کی ساری عمر علی گڑھ میں گذری جہاں امراء اور ارباب جاہ کا تانتا لگا رہتا تھا، مگر انھوں نے کبھی کسی کی خوشامد نہیں کی، اور نہ ان میں سے کسی سے دب...

حکم الانتفاع بالمرھون عند الفقهاء: دراسة مقارنة

Islam is a complete code of life and dominant upon all the faculties of life. Along with creed faith and worship, Islam has emphasized on the affairs of daily life. In the connotation of affairs all the components of sale and purchase mentioned in detail. Accordingly, there is a provision if someone sell a thing to another and the buyer is not eligible to pay the price then there should be written a statement in the presence of two witnesses to pay the price in fix time. If there is neither witness nor the arrangement of writing, so there should be mortgaged something from the buyer. When the buyer pay a loan then the seller should return the mortgaged thing. The originality of mortgage is for the protection of loan not for profit. In present era the purpose of mortgage has changed and is done it for getting profit. Although some imams and Ahl-e-Zawaher provide the capacity for getting profit, so the Jamhoor and Ahnaf don’t allow anyone to get it. To change the original shape of mortgage is illegitimate and is considered as usury. If there is no custom in a certain territory and the man who offer loan does not intend to get profit then with the permission of the person who has received loan __provides the facility to get profit, However to avoid this practice is far better in shariah. In the article understudy the originality of mortgage and dissension among different Imams to get profit from it has been discussed. In the end a crucial statement has been mentioned.

Health Locus of Control, Health Beliefs, and Health Related Behaviors: A Study of Urban Females

The present research consisted of three studies. This research aimed to explore the role of health beliefs, knowledge, and education in health related behaviors of urban females. Additionally, it aimed to generate data that can give a direction for action to health policy makers concerned with women’s health. The objective of Study-I was to examine the impact of health locus of control, self efficacy, and education on health related behaviors. The broad level objective was to identify those segments of urban female population that need special attention of health professionals and researchers. The sample comprised 150 urban females, educated and illiterate. The educated and illiterate respondents were found to be significantly different on internal health locus of control/ IHLC, chance health locus of control/ CHLC, and self-efficacy. The educated women were higher than their counterparts on IHLC and self efficacy. The representations of health of the respondents indicated that educated women understood health in a more global sense of well being, whereas the illiterate took health to be more of a physical phenomenon. Years of education were found to be positively correlated with one’s health knowledge and health behaviors. Health knowledge and health behaviors were significantly positively correlated. Self-efficacy was found to have a significant positive correlation with HLC, health knowledge, and health behavior. Study II purported to examine relationship between IHLC and self efficacy with patient’s report for timely or delayed diagnosis. The sample consisted of 60 female heart and cancer patients, timely and delayed diagnosed according to the doctors’ ratings. No significant differences were found between the HLC and self-efficacy of the two sets of patients. The respondents in this study however scored significantly higher on powerful others health locus of control/PHLC and chance health locus of control/CHLC than the IV respondents in Study 1. The representations of health of majority of respondents reflected their concern with physical aspects of health. Study III followed a before- after no control group design. The sample consisted of 50 graduate level female students. The purpose of this study was to study the impact of health information provision on the participants’ health related beliefs and behaviors. It aimed to examine if exposure to health knowledge pertaining to breast cancer could change the participants’ perceived breast cancer related self-efficacy and health behaviors such as breast self examination. Participants’ knowledge and behavior related to breast cancer were assessed in the pre- exposure phase, followed by an exposure session in which the participants were shown a video CD, participated in a discussion, and were given take-home health education literature about breast cancer. Two weeks after the exposure, the participants were assessed on the same measures again. Health knowledge, behavior, and self-efficacy were found to have significantly improved. It has been recommended that health education be provided to women through school curricula as well as mass media in order to improve health behaviors and corresponding self efficacy. Reliability of all the scales used in these studies was also measured. The alpha values obtained for the Urdu version of HLC scales have been found to be from .56 to .65; .67 to .78 for Representations of health scale; .80 to .83 for Self efficacy scale; and .72 to .76 for breast cancer self efficacy scale in the three studies.