The damage tolerance behavior of integrally and conventional stiffened panel is investigated based on the fracture mechanics and finite element analysis. The load bearing capability and crack growth characteristic of both types of the stiffened panels having same configuration subjected to distributed tensile load is examined in this paper. A fourteen-stringer stiffened panel is analyzed for a ...

This paper presents a coordinated effort to model, test and validate the structural response of complex aerospace rib-skin structures in both undamaged and damaged configurations. Coordinated experimental and finite element model results are presented for cylindrical rib-skin structures each approximately nine foot long, and thirty inches in diameter. The test articles considered are of riveted...

Americans are deeply divided over the meaning of the poverty and racial exclusion revealed in the wake of Hurricane Katrina. Media accounts of the hurricane riveted, angered, and depressed many Americans, but did not lead to a national consensus in favor of new policies to fight poverty and economic inequality. This article considers theories and research evidence that may help to explain this ...

The growth of Indian manufacturing sector depends largely on its productivity & quality. Productivity can be improved by reducing the total machining time, combining the operations etc. In case of mass production where variety of jobs is less and quantity to be produced is huge, it is very essential to produce the job at a faster rate. This is not possible if we carry out the production by usin...

In the current study, behavior of crank-slider mechanism with single and multiple clearance joints are analyzed. Using Lankarani-Nikravesh theory for estimating discontinuous contact forces in clearance joints, relevant systems have been mathematically modeled. Through numerical simulations, perturbations in response of mechanisms with clearance joints have been analyzed. Effects of increasing ...

Tubular KT-joints are quite common in offshore structural design and despite the crucial role of stress concentration factors (SCFs) in evaluating the fatigue performance of tubular joints. However, the SCF distribution in internally ring-stiffened KT-joints have not been investigated and no design equation is currently available to determine the SCFs for this type of joint. In the present pape...

In April 1994, the small east African nation of Rwanda became the site of one of the most violent episodes of the 20th century. Over the course of just 100 days, an embattled authoritarian state organized the slaughter of at least 850,000 Rwandans. Briefly, worldwide attention was riveted. But clichés about "age-old tribal hatreds" soon dominated discussion, conveying the impression that this w...

A large number of metallic riveted bridges have been constructed using flat plates to form the deck of the structure. When assessed using traditional elastic methods these plates are routinely found to be under capacity for the application of the prescribed load even though they show zero signs of distress. This paper considers the use of alternative methods of assessment, namely yield line and...

"A dead child" said stalin "is a tragedy. Two million are a statistic." A single photograph of a beach riveted world attention, converting syrian refugees from statistics to tragedy. But the statistics remain. Three Canadian columnists have offered contrasting interpretations. Eric Reguly argues that a static and aging Europe needs more manpower to sustain its economy. Margaret Wente, however, ...