Aluminum Lower What is the best method to straighten an aluminum 'bull-bar' without weakening the metal?
The bar has nudged a stump on the lower left corner and twisted up. I have released the brackets to see if it would spring back but it wont.
Aluminum depending on the grade has a severe memory property to it.
Meaning not how it was cast or extruded, but that bend will always be in that piece of metal.
Even after you straighten it, the aluminum metal will always remember that injury.
Many alloys can be straightened with conventional methods, many will just snap.
I've always found it kind of funny that you can bend it by accident and it seems just as strong but distorted.
But when you try to bend it back,,,,,,, it says no way.
I do not know the term Bull Bar, but my initial guess is vacuum or pressure cast.
Very strong.
Heat will do nothing to the property of this type of metal until it fails (melts)
Curtain wall aluminum composite panel refers to the composite panel applied as building curtain wall. It is the composed panel with plastic material as the central layer and aluminum on two sides of it, as well as decorative and protective coatings or films as the decorative sides.
Now, there are stricter quality requirements for new materials in construction and building decoration. The aluminum manufacturers, based on those requirements, bring forward more standard quality control methods and means. The national standard, GB/T17448-2008 Aluminum-plastic Composite Panel for Curtain Wall, details on the quality control indexes and testing methods of aluminum-plastic composite panel. Labthink Instruments Co., Ltd. (www.labthink.cn), as the excellent provider of testing instruments and testing services, introduces the relevant testing items and methods according to GB/T17448-2008 and other international standards.
1. Chromatism Testing
According to the standards, ocular estimation is the method for chromatism testing. It should be done under natural light and not in direct sunshine. However, there are no regulations on illumination, and the testing results are varied owing to different environments. Labthink introduces PARAM SBG-80 D65/A Standard Light Source and PARAM SPS-80T Double Light Source Color Matching Desk, specializing in precise color discrimination. Their light sources are similar to the spectrum power distribution of actual sunlight. Their technical indexes can guarantee all-weather color observation and comparison, so as to avoid varied color determinations caused by different light environment.
2. Thickness Test of Aluminum and Composite Adhesive Film and the Error
2.1 Aluminum Thickness Testing.
According to GB/T 17748-2008, take a piece from the aluminum as the specimen, and measure the aluminum thickness with the thickness tester of 0.001mm(1?m) resolution. Every specimen should measure 5 points at least, including four angles and the central part. The thickness result is the Min. average and arithmetic mean of all the measurement.
Labthink PARAM CHY-C2 Thickness Tester and PARAM CHY-CA Thickness Tester can satisfy division value requirements of the aluminum thickness precisely. Now, aluminum material is quite expensive, the precise measurement of its thickness can control the quality and reduce costs reasonably. Therefore, such high precision thickness tester is the best choice for aluminum thickness measurement.
2.2 Composite Adhesive Film (Macromolecule Film) Thickness Testing
The thickness testing of composite adhesive film complies with GB/T 6672-2001 Plastics Film and Sheeting--Determination of Thickness by Mechanical Scanning and its relevant regulations, Labthink PARAM CHY-C2 Thickness Tester and PARAM CHY-CA Thickness Tester can also suit the composite adhesive film (macromolecule/high polymer film) thickness and thickness error measurement.
3. Coating Gloss Deviation Testing
According to GB 9754, 20 degree gloss meter should be applied to test. When testing, the testing data of more positions is preferable. The difference between the maximum and the minimum values is regarded as the gloss deviation of the curtain wall aluminum-plastic composite panel. Labthink PARAM Glossmeter specializes in the rapid and accurate gloss testing of flat coating and painting surface. This instrument is portable in size, stable in quality and reliable in measurement. The resolution is 0.1 glossiness unit.
4. The Peeling Strength Testing
The peeling strength of curtain wall aluminum-plastic composite panel is of vital importance. The competence of composite strength between the aluminum panel and the plastic layer is the guarantee for future stable and reliable performance. The testing procedure is as follows:
Peel two ends of the aluminum material to be tested, of which, cut the central plastic part and aluminum part of one peeled end. Then, clamp the remaining aluminum on the upper panel and connect with the upper clamp. Clamp the other peeled end on the roller. Keep the length axis in vertical direction with the central axis of the roller, clear zero of the tester load, and connect the lower panel with the lower clamp of the tester. Then, set the testing speed of 25mm/min for tensile until a minimum of 150mm is peeled. Record the peeling strength and curve simultaneously. Though there are detailed regulations of specimen preparation in the standard, the specimen preparation process would affect status of the two ends of the specimen. Thus, in order to obtain accurate data and reduce the influence of the preconditioned (pre-peeling) process to the testing results, the tester should have a function of end deletion. Labthink PARAM XLW Auto Tensile Tester specializes in the material peeling strength testing, which is of high precision and is equipped with powerful software including the end deletion function, which can better suit the peeling strength testing demand of the aluminum-plastic composite panel.
Besides, PARAM Auto Tensile Tester can perform 180 degree peeling strength, roller peeling strength, tensile strength and elongation rate testing of protective film and laminated adhesive film (high polymer film) of aluminum-plastic composite panel.
5. Tearing Strength Test of High Polymer Film in Aluminum-plastic Composite Panel
According to GB/T17448-2008, Aluminum-plastic composite panel for curtain wall, the tearing strength test of high polymer films is also called vertical tearing strength. AS the testing method is GB/T11999, Plastics Film and Sheeting Determination of Tear Resistance?Elmendorf Method, therefore, it is better to be termed as Elmendorf Method Tearing Strength. Labthink PARAM Tearing Tester is the applicable tester for such tearing strength testing.
Further information please feel free to contact Shirley Wu via trade2@labthink.cn, skype:shirley-labthink, MSN:shirleywu_labthink@hotmail.com or (tel)0086-531-85068709.
About Labthink:
Labthink, the excellent provider of testing instruments and testing services, is devoted to provide most excellent and complete quality control solutions for pharmaceutical, foodstuff, cosmetics, packaging, printing, adhesive, automotive, petrochemistry, environment, biology, new energy, construction, aviation and electronic industries worldwide.
