Mechanical properties of Methacrylic Plexus MA300 adhesive material determined in tensile test and butt joints of aluminum thick plates

Abstract

Adhesive joints are an alternative method of joining elements. New adhesives achieve cohesion and adhesion strength comparable with plastics used for structural components and coatings. Bonding is faster, simpler and cheaper. For this reason, adhesive joints are increasingly replacing other types of connections. Tests show that the material properties in the cast adhesive specimens differ from the ones determined in the joint. Adhesive producers most often describe the strength of the overlap joint tested in accordance with ASTM D1002. Strength, modulus of elasticity and elongation to break tested in accordance with ASTM D638 are reported less frequently. The article presents a method for determining the mechanical properties of the adhesive in a butt joint and differences in the determined values in relation to the cast specimens on the example of methacrylic adhesive Plexus MA300. The tests were carried out for joining aluminium rod with a square cross-section of 15 mm x 15 mm and adhesive layer thickness of approximately 1 mm. The fractures of cast specimens and butt joints were analyzed.

Dissimilar material joining of densified superwood to aluminum by adhesive bonding

“…Figure 4 shows the maximum joint strength of aluminum-tosuperwood (7.6 MPa) achieved in this investigation, in comparison with the maximum strengths reported in literature for aluminum-to-aluminum [25][26][27] and natural wood-to-wood [28] joints and to tests done on superwood-to-superwood bonding of samples using the same adhesive as the superwood-to-aluminum. The adhesive joint strength of natural wood was between 2 and 5 MPa depending on surface roughness, with surface roughness of 1.2 to 1.7 µm producing the best results [25].…”

“…An epoxy resin was used in these samples with similar shear strength (16.6 MPa when using aluminum as substrate as per manufacturer data sheets) to the MMA adhesive used in superwood bonding (13.8-19.3 MPa as per manufacturer data sheets). In aluminum bonding with Plexus MA 300 poly methyl methacrylate (PMMA) adhesive, Maćkowiak et al [28] saw that with the stronger MA300 methacrylate adhesive (20.7-26.2 MPa shear strength as per manufacturer data sheet), there was a butt-joint yield stress of 21.2 MPa. Using the Tresca uniaxial shear stress failure theory, this joint can be approximated to have a 10.6 MPa shear stress.…”

Verification of Selected Failure Criteria for Adhesive Bonded Elements with Different Stiffness through the Use of Methacrylic Adhesive

“…Numerical methods provide more freedom in creating a joint geometry [ 7 , 8 , 9 ], however, it is necessary to use appropriate models and material data for the adhesive and the elements to be bonded. The mechanical properties of an adhesive can be obtained for cast specimens [ 10 ] or for specimens which are tested for the joint adhesive layer [ 11 ]. It is also necessary to accept a criterion in the form of a boundary value, the attainment of which means that the maximal, permitted loading of the joint has been achieved [ 12 , 13 ].…”