<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Experimental testing of epoxy adhesives, which are commonly used in civil engineering for the strengthening of existing structures with composite products have been a topic of limited studies. It was due to the damage which usually occurred not in the adhesive layer but in the strengthened material. Recent studies have shown that the choice of an adhesive significantly affects the load-bearing capacity of the entire joint. The paper presents the results of strength tests of a selected methyl methacrylate adhesive, carried out according to the standards EN ISO 527-1 and EN ISO 527-2. Comparing the results to the data provided by the manufacturer (tested in accordance with ASTM D638) discrepancies have been found in the normative assumptions and consequently differences in the results. Experiments on the adhesive showed clear dependency on the speed of testing which revealed through variable characteristics after the elastic limit. Numerical simulations were also carried out assuming the elastic-plastic material model. The analyses allowed to obtain the distribution of stresses and deformations along the length of the sample and allowed to verify the length of the extensometer used. Comparison of results obtained for different measuring lengths of chosen adhesive confirmed the need to use extensometers in the testing of mechanical properties.</p>
</abstract>

Experimental testing of epoxy adhesives, which are commonly used in civil engineering for the strengthening of existing structures with composite products have been a topic of limited studies. It was due to the damage which usually occurred not in the adhesive layer but in the strengthened material. Recent studies have shown that the choice of an adhesive significantly affects the load-bearing capacity of the entire joint. The paper presents the results of strength tests of a selected methyl methacrylate adhesive, carried out according to the standards EN ISO 527-1 and EN ISO 527-2. Comparing the results to the data provided by the manufacturer (tested in accordance with ASTM D638) discrepancies have been found in the normative assumptions and consequently differences in the results. Experiments on the adhesive showed clear dependency on the speed of testing which revealed through variable characteristics after the elastic limit. Numerical simulations were also carried out assuming the elastic-plastic material model. The analyses allowed to obtain the distribution of stresses and deformations along the length of the sample and allowed to verify the length of the extensometer used. Comparison of results obtained for different measuring lengths of chosen adhesive confirmed the need to use extensometers in the testing of mechanical properties.

Determination of Mechanical Properties of Methyl Methacrylate Adhesive (MMA)

Architecture, Civil Engineering, Environment

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"Determination of Mechanical Properties of Methyl Methacrylate Adhesive (MMA)"}

Experimental testing of epoxy adhesives, which are commonly used in civil engineering for the strengthening of existing structures with composite products have...

Speed of testing mm/min	No.	Tensile strength, σ_p MPa	Strain related to tensile strength, ε_p %	Strain at failure, ε_f %	Modulus of elasticity, E MPa	Poisson’s ratio, μ
Technical Data Sheet [19]
Unknown		18.6÷20.7	-	30÷50	517÷689	0.41
Current tests data
1	1	-	-	-	-	0.363
	2	-	-	-	-	0.344
	3	-	-	-	-	0.387
	4	15.24	3.90	5.71	1125	-
	5	15.06	4.69	10.01	1077	-
	6	13.51	3.73	9.50	938	-
	7	14.85	4.07	10.36	1074	-
	8	14.85	4.15	6.17	1075	-
Average		14.70	4.11	8.35	1058	0.365
Stand. Deviation		0.61	0.32	1.99	62.9	0.018
Coeff. of variation		4.15%	7.79%	23.83%	5.95%	4.93%
10	9	16.58	3.25	9.83	1141	-
	10	16.66	3.11	5.79	1137	-
	11	16.64	3.22	5.35	1161	-
	12	15.42	3.08	4.80	1128	-
	13	15.73	3.37	8.28	1090	-
Average		16.21	3.21	6.81	1131	-
Stand. Deviation		0.53	0.10	1.92	23.3	-
Coeff. of variation		3.27%	3.12%	28.19%	2.06%	-

Speed of testing mm/min	σ_e MPa	ε_e %	σ_p MPa	ε_p %	ε_f %
1	8.00	0.83	14.65	3.80	8.30
10	11.00	1.15	16.20	3.10	7.10

Determination of Mechanical Properties of Methyl Methacrylate Adhesive (MMA)

Published Online: Apr 04, 2019

Page range: 87 - 96

Received: Dec 15, 2017

Accepted: Apr 15, 2018

DOI: https://doi.org/10.21307/acee-2018-041

Keywords
Methacrylate, MMA, Mechanical properties, Influence of test speed

© 2018 Marcin Kozłowski et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Figure 9.

Figure 10.

Figure 11.

Figure 12.

Summary of material parameters of the analyzed adhesive

Material parameters used in numerical analyses

Determination of Mechanical Properties of Methyl Methacrylate Adhesive (MMA)

Published Online: Apr 04, 2019

Page range: 87 - 96

Received: Dec 15, 2017

Accepted: Apr 15, 2018

DOI: https://doi.org/10.21307/acee-2018-041

KeywordsMethacrylate, MMA, Mechanical properties, Influence of test speed

© 2018 Marcin Kozłowski et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Figure 9.

Figure 10.

Figure 11.

Figure 12.

Summary of material parameters of the analyzed adhesive

Material parameters used in numerical analyses

Keywords
Methacrylate, MMA, Mechanical properties, Influence of test speed