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thanks for your helpful tips. I would first design a rough model and then do FEM analysis to check the stresses and deformations.

Yeah, it looks nice. But where should one start? free body diagram Thanks

Thank you for your answer. According to the project, it is not the economic aspect that comes first and foremost, but lightweight construction. and the model must be made of at least 90% wood.

Hello can someone please tell you what to start with to construct a Kids Bike Traile Linkas 3D. it should select material and geometry. I think I should start sketching with forces (children's weight)! and type of load (whether it is tensile, compressive or torsional), then select the...

Are there current research results (maximum 10 years) that have successfully developed a sandwich made of low-cost materials that are environmentally friendly? I hardly find anything on the internet. Thank you very Much

you're right, my supervisor advised me not to put many adhesives on the core, he said that they are evenly distributed under pressure on their own. the problem is the core is too dry and not quite flat

Thank you very much best forum

is there any other experimental method to determine the bending rigidity and shear stiffness of a sandwich (three-point bending test) outside Allen's method? Allens method is described in his book "Analysis and Design of Structural Sandwich Panels" on page 258 Thank you

I just happened to notice something now. the support bars and loading bar are not equal in size! that will lead to different pressures on both sides.

Chemists have optimized the mixture by means of Design of experiment: Mixture is: - 200 g paper fibres, 800 ml water (ratio 1:4) - 9 % binder (CMC), based on the dry matter pulp = 18 g - 3 % raising agent (NaHCO3), based on the dry matter pulp = 6 g - Microwave drying process yes, the weight...

Thank you very much for the names of the adhesives, I searched for them in Google. these are real good adhesives Thank you for your suggestion for adhesive. yes, the costs in this project are also important, so we try out cheap materials. Thank you very much for pointing out that the surface...

"pulp foam" consists of a carton of eggs mixed with water, CMC(Carboxymethyl cellulose) and NaHCO3 and then leave to dry in a microwave oven. Adhesive bond is left on both surfaces, but mostly on the skin. Flax has been in the laboratory for 2 years. can you please name some glues that are good...

thanks for the answer The test is 3 point flexure test in all samples, this kind of failure has occurred: core failure adhesive failure usually fails glue first. the adhesive used is polyurethane in pasty form. would it be better if I used glue in liquid form? core consists of pulp and Faces...

Hi, that's force-displacement diagram of a sandwich, Sandwich consists of pulp foam and flax laminate The aim of the sandwich is to absorb energy, which can later be used in a crush box. How do the results look like? Are there any remarks? I also have pictures for each sample, I can upload it...

Sorry last days I couldn't write as I have to make and test and evaluate many trials. it finally worked out, and exactly how you described it to me. Thank you Very Much is a deviation of 8% between experiment and FEM poor?

Thank you very much Your advice was correct. I did the experiments yesterday. I have produced all variants, 0°/0° is the best variant 45°/+45° is the weakest.

Thank you for your important answer. we do this test to measure deflection and bending strength of sandwich. my material is not woven, but is a UD-fabric (I don't know what it is called in English, see Attachement). how will it look like when I work withClassical Lamination Theory and calculate...

Hi All, I have to do a four point flexural test for sandwich I have to find a suitable Face for my core of the sandwich. I am to choose one of these three choices: first selection: 2 layers 0°/0° second choice: 2 layers 0°/90° third choice: 2 layers -45°/45° I am for first choice(0°/0°), because...

Thank you for your useful answers I have searched for an answer for a long time that saves my samples next week. thank you

Thank you for your valuable reply. I want to maintain the flexural strength of a sandwich we have already tested Kern alone and received the shear modulus. I chose the wrong standard? There is also other standard D7249/D7249M, but it is for surface course and long beams. our sample can be...