外国人做的bra分析效果图

chunyu

外国人做的一个分析《绝世好bra》

belldingding

有没有简单的背景介绍呀

stevenfeng2003

太厉害了。还有吗？继续。

femman

Clothing manufacturing uses non-linear finite element techniques to analyze the stresses on clothing such as; pants, shirts, sneakers, and lingerie.   An interesting project by one of our participants was the analysis of a bra design.
  
Excerpt from the web site OASYS - LS-DYNA Applications:  
In this particular case the consulting engineers, Ove Arup & Partners' Advanced Technology Group used dynamic non-linear finite element techniques to analyze the bras structural performance.  A computational representation of the bra on a body was created by scanning the geometry of the model, Loen, who was featured in the program. The bra was then constructed using techniques usually associated with the modeling of airbags and seatbelts in cars. This enabled the non-linearity of the bra material, contact interaction with the body and large displacements to be represented. The performance of the bra was then analyzed by applying vertical accelerations to simulate a person jogging lightly or walking briskly. The analysis displayed fluctuating stresses in the bra cups and straps, varying with the walking pattern, and a higher constant stress around the base band where the bra was pulled tight onto the body  
  
============================
Bra analysis
  
The search for a bra with a perfect fit has been made by many women over the years. However, until recently there has been little application of engineering to bra design despite an early patent brought by an aeronautical engineer. In fact, the basic design has not changed dramatically since its appearance in 1885.In the past year there has been an emergence of interest in designing the perfect bra.
Most recently it became the subject of a program broadcast on UK TV Channel 4 on the 24 June 1998. 'Designs on Your Bra' followed London based industrial designers, Dick Powell and Richard Seymour, as they attempted a radical redesign of the bra.
  
========================
The recent interest in bra design has been prompted by the fact that average breast size is getting bigger. In the last few decades the average breast size has increased from 34B in the 1950s to 36C today.  Modern bras, which are mostly designed from a fashion perspective to look flattering, are unable to provide the necessary support. Comfort is also an issue. A study by Nottingham Trent University showed that 70% of women were wearing a bra that doesn't fit properly. Either women cannot find sizes to fit them or the bra size alters with wear and washing. The problem for manufacturers is then to produce a bra with the necessary support and fit, with no loss of performance over time, which is attractive to the eye and is capable of all of this in a wide range of sizes. The role of Arup's Advanced Technology Group in assisting Powell and Seymour in this difficult task was to assess the performance of the existing bra design. Louise Waddingham, who undertook this unusual analysis task noted, "The group is used to advising a wide range of designers, engineers and manufacturers and specialises in using advanced engineering methods in the vehicle, nuclear and seismic engineering industries." In this particular case the Arup engineers used dynamic non-linear finite element techniques to analyse the bras structural performance.  A computational representation of the bra on a body was created by scanning the geometry of the model, Loen, who was featured in the program. The bra was then constructed using techniques usually associated with the modelling of airbags and seatbelts in cars. This enabled the non-linearity of the bra material, contact interaction with the body and large displacements to be represented. The performance of the bra was then analysed by applying vertical accelerations to simulate a person jogging lightly or walking briskly. The analysis displayed fluctuating stresses in the bra cups and straps, varying with the walking pattern, and a higher constant stress around the base band where the bra was pulled tight onto the body. More interestingly, the behaviour of the underwiring was revealed. As manufactured, the underwiring is a two dimensional form. When being worn the wire undergoes bending in two directions. It is bent around the body as the bra is put on and also bends in the other direction as it supports the weight of the breast. In addition, the axial forces along the length of the wire are significant in its tendency to pop out of its casing after repeated wear. Seymour & Powell focussed on the inefficiency of the underwiring and in their bra design proposal they replace the wire with 'Bioform', a large plastic moulded support that extends to the underarm area. In their TV program they claim the Bioform bra fits all the requirements of support, comfort and washability as well as adapting across three sizes at once. In fact, their ideas were received well by Charnos, a leading bra manufacturer, and the production of a commercial Bioform bra is being considered.  
======================================