Behind the Wheel is a blog created by Stellana for the wheel industry. Whether you are new to polyurethane wheels or have been in the business for a long time, this blog is a great tool for polyurethane education, industry safety, company news and updates, and much more.
Quality | Understanding & Reducing Hysteresis
Understanding and Reducing Failures:
Polyurethane is one of the most versatile materials.1 Physical properties can be adapted to solve challenging problems. Polyurethane
is formed by reacting a polyol (ether-based or ester based) with an isocyanate
(an MDI or TDI). It is then cured at a specific temperature for the optimal
time to reach desired physical properties. Properties are altered based on the
polyol and isocyanate and the application impacts the function. It is critical
to choose the ideal material based on the application and the conditions the
product is expected to withstand.
What is Hysteresis?
Hysteresis is a time-based dependence that relies on present and past inputs. Polyurethane is an excellent insulator and absorbs and stores energy,
which will then be converted to heat. If heat generation is greater than heat dissipation,
the polyurethane will melt internally, resulting in a buildup in pressure as
the material expands. The increase in temperature will change the physical
properties of the material. Evidence of
hysteresis can be indicated with a powder like substance, bumps on the tire, or
visible molten material. The most common causes of hysteresis are overloading
the part or operating at too great a speed.
Contributing factors to heat buildup in tires include: poor
conductivity of polymers, tread thickness, size of tire, speed of rotation,
load on tire, TIR of tire, and length of run. Improper installation- metal hub
rubbing on other metal object causing friction will generate heat.
Metal objects imbedded in the tire promote heat generation.
In the picture, a metal object is imbedded in the tire. The metal will absorb heat and raise the temperature of the wheel. As a result, the material changed physical properties and burned off the adhesive.
Hysteresis is commonly mistaken for bond failure. What is Bond Failure?
Bond failure is a result of improper surface preparation,
contamination, or machine malfunction. A true bond failure will leave adhesive
intact on the metal. The excessive heat generation in the hysteresis process will burn off adhesive on the poly or metals, or both.
Ways to Avoid Hysteresis
You can significantly reduce costs associated with downtime
and extend the life of your product with the proper conditions of the
application. Decrease speed of trucks, load capacity, or length of runs. Experts
will help you choose the correct system based on the application needs. Engineering experts will review
the design of the tire and optimize the cross-sectional thickness, runout, and
The Hyperloop pod competition was first announced in 2015 by SpaceX. Student teams were challenged to design and build the best functioning, innovative prototypes of high-speed pods. Since the announcement in 2015, three competitions have taken place in January 2017, August 2017, and July 2018. Over the course of the competitions, Stellana has gained recognition by demonstrating success through their wheels and tires. This year we are working with a couple of groups, one of which is MIT Hyperloop II. Piper Howell, Stellana Engineer, has worked closely with this team and was able to attend the pod unveil May 22. We have put together a brief Q&A to provide some insight into the competition and the future of this alternative transportation. How did Stellana begin working with MIT Hyperloop II? The lead of MIT’s team, Vik Parthiban, had participated in a prior competition as an undergraduate student in Texas. After beginning graduate school at MIT, he took on the role as th
How many days a week do packages arrive at your household? For some of us, you could even ask how many times a day do packages arrive at your house? Buying habits and expectations have been changing for some time now, and these trends are forcing warehousing and manufacturing operations to adapt. There is little to no room for downtime, and forklift wheels and tires play a crucial role in keeping things moving during the seasonal peaks and shopping holidays such as Cyber Monday. Current Climate in the World of Ecommerce Ecommerce trends are making order fulfillment more complex. In general, consumers are placing smaller orders more frequently. With the ease of online ordering, it is not unusual that someone places an order, then a few hours later, places another order with an additional item they forgot. With a just few clicks, a passing thought can become a purchase. Seamless operations provide the ultimate convenience for the purchaser, but behind the scenes with each ord
About New Tech Machinery New Tech Machinery (NTM), based out of Denver, CO, is the leading manufacturer of the portable rollforming machines that include seamless gutter machines, metal roof panel machines, and other specialty equipment. NTM transformed the metal construction industry by bringing contractors easy-to-use rollforming solutions directly to the job site. New Tech Machinery was also the first portable rollforming company to commercially produce and market a polyurethane drive roller machine with separate forming rollers. Due to their history of innovation, NTM’s designs are frequently imitated throughout the industry and most have implemented this technology. Wheel Malfunction This machinery is used by contractors and other professionals within the metal construction industry to form metal sheets into rain gutters, metal roofing, siding, and more. NTM was experiencing continual adhesive and bonding issues in the wheels previously used on their equipment