Nissan just announced the expanded use of an Advanced High Strength Steel (AHSS) that has a tensile strength of 1.2GPa (= 1,200MPa = 175 ksi = 175,000 psi). This follows their initial announcement in October 2011. Things we’ve learned: The complex microstructure consists of 2 hard phases and 1 soft phase. The scale of the microstructure is micron / submicron. A new welding process needed to be developed to [...]
We all hear frequent discussion about Advanced High Strength Steels, increased use of aluminum, and carbon fibres. Much of the discussion in automotive focuses on materials and processes to increase product strength and reduce mass. A pamphlet published by Volvo Construction Equipment (http://tinyurl.com/d3c3cvh) discusses the increasing role industrial design plays in new product development. Are we looking far enough forward in product design to anticipate the additional forming challenges we will [...]
Honda has developed a production manufacturing process that lets them join steel to aluminum skin panels. The first application of this will be on the 2014 Acura RLX, which will have an aluminum door skin joined to a steel door inner. This technique is projected to reduce the weight of the doors by 17%, and improve ride stability by concentrating the weight closer to the vehicle center. This application [...]
Through my website, someone asked about the deformation modes in sheet metal forming. My response: The three deformation modes in three-dimensional forming are draw, plane strain, and stretch. These can be visualized by imagining a circle of known diameter etched into the sheet metal when it is still a flat blank. Deforming the blank turns the circle into an ellipse. By definition, the longest dimension of the ellipse is [...]
Sales of the 2013 Dodge Dart were lower than initially projected in 2012 because only manual transmissions were available at launch, with a six-speed automatic sourced from Hyundai serving as a stopgap until a promised nine-speed automatic is available. In addition, Chrysler reportedly is pressuring Jeep Wrangler and Grand Cherokee suppliers to increase capacity after bottlenecks cost the company 60,000 to 70,000 lost sales globally in 2012. http://www.autonews.com/apps/pbcs.dll/article?AID=/20130114/RETAIL01/130119913/marchionne-says-darts-slow-start-due-to-transmission-availability http://www.autonews.com/apps/pbcs.dll/article?AID=/20130114/OEM02/130119892/chrysler-lost-60-70k-jeep-sales-to-production-bottlenecks-marchionne [...]
Bloomberg article highlights: * Morgan Stanley predicts a 29 percent gain in aluminum prices by 2018. * At current aluminum prices, which are more than a third below 2008 highs, at least 30 percent of aluminum companies aren’t making money. * The metal has failed to revisit the $3,317 a ton level reached in 2008, averaging about $2,200 in the past five years. * The global surplus of aluminum [...]
Global brewing company SABMiller has developed a bottle crown that reduces the crown thickness to 0.17mm from a typical thickness of 0.22mm to 0.24mm. This thickness change of 50 microns reduces the standard crown weight from 2.38g to 2.14g, corresponding to a 360g reduction on every pallet. Although this may not seem like a significant reduction, SABMiller uses 42 billion steel caps a year. If implemented globally, this change [...]
Through my website, someone from a manufacturing company asked how to calculate thinning in a sheet metal part made from 2mm thick high strength steel. My response: First, I assume the nominal or expected thickness is 2mm. But this is just the aim thickness. The steel mill is allowed to ship product that has some deviation from this gauge – maybe 1.85mm to 2.15mm as an example. So you [...]
2013 Honda Accord body structure is made of >55% high strength steel with tensile strengths starting at 440MPa. Of this, >17% is ultra high strength steel, with tensile strengths of 780MPa, 980MPa, and a martensitic grade 1500MPa. This 2013 model represents the first use of UHSS in the Accord lineup. In addition, the subframe has steel and aluminum components that are joined via friction stir welding. http://www.honda.com/newsandviews/article.aspx?id=6825-en http://www.autofieldguide.com/articles/honda-accord-the-ninth-generation# -Danny [...]
The next meeting of the National Research Council (NRC) Committee on Fuel Economy of Light-Duty Vehicles, Phase 2 will be a lightweighting workshop focused on lightweighting, mass reduction and their impact on fuel economy. On the agenda for the meeting that will be held on February 12-13, 2013 in Ann Arbor, Michigan are representatives from the steel, aluminum, composites, and carbon fiber industries. Agenda: http://www8.nationalacademies.org/cp/meetingview.aspx?MeetingID=6475&MeetingNo=5 Registration: http://www8.nationalacademies.org/EventRegistration/public/Register.aspx?event=70292DDD Info: http://www.cargroup.org/?module=News&event=View&newsID=40 -Danny Schaeffler http://www.EQSgroup.com http://www.Learning4M.com [...]
