scholarly journals SIMULATION OF THE DAMAGE PROCESS OF THERMAL GLUE BOND

2021 ◽  
Author(s):  
Oleksandr L. Sokolskyi ◽  
Yuliya Yu. Herasimenko
Keyword(s):  
Tensile Load ◽  
Nonlinear Behavior ◽  
Bond Line ◽  
Ease Of Use ◽  
Test Method ◽  
Correct Selection ◽  
Computer Design ◽  
Adhesive Bonds ◽  
Damage Process ◽  
Bonding Technology

Background. Thermal glue bonding technology is widely used to create paper and paperboard packaging and polymer packaging in the chemical, food, and textile industries. To meet the needs of the consumer, it is necessary to provide a sufficient level of packaging strength and ease of use. When creating strong quality packaging, special attention should be paid to the correct selection of materials and equipment. To create a strong and reliable bond, it is necessary to understand the behavior of adhesive bonds, which depends on the following factors: type of adhesive, curing time, type of bond, the thickness of the bond line, etc. Therefore, for more efficient use of adhesive materials, it is necessary to develop reliable methods for designing and predicting the behavior of adhesive bonds. Objective. Development of an objective test method and a method for predicting the behavior of a thermal glue bond during debonding to analyze its strength. Methods. The article considers an integral method for determining fracture toughness, which can be used regardless of the form of the bond, as well as the linear or nonlinear behavior of the thermal glue. To predict the behavior of an thermal glue bond under load, a computer design model was developed and a numerical calculation of deformations and stresses arising in the thermal glue bond during a tensile load was carried out. Results. The dependences of the stress in the middle of the bond on the displacement and the force at the edges of the sample on the magnitude of the tensile stroke were obtained, which makes it possible to evaluate the quality of the bond and the effect of the stiffness of the thermoplastic adhesive on the damage of the bond. Conclusions. An analysis of the data obtained showed that the forces at the edges of the sample are directly proportional to the magnitude of the stretching stroke, and also that the destruction of the thermal glue bond occurs after reaching the ultimate strength of the adhesive, the magnitude of the stresses first increases to the limit, and then remains constant until complete damage.

scholarly journals PENGARUH DIAMETER TIANG TERHADAP TAHANAN GESEK TIANG DALAM TANAH LEMPUNG

2019 ◽  
Vol 1 (3) ◽  
pp. 219-224
Author(s):  
Andikanoza Pradiptiya ◽  
A’isyah Salimah
Keyword(s):  
Pile Foundation ◽  
Structural Damage ◽  
Tensile Load ◽  
Frictional Resistance ◽  
Test Method ◽  
Scale Model ◽  
Friction Resistance ◽  
Average Value ◽  
Constant Rate ◽  
Pile Model

AbstractSome buildings impose limits on the foundation displacement that occur with relatively small values so as not to cause structural damage. The test method used was to make a model test box as a testing medium by simulating the actual model into the form of a scale model. The study was conducted using a single pile foundation with reduced scale, made of concrete with a diameter of 0.02 m, 0.03 m, 0.04 m and the length of each pile was 0.4 m. The pile model was mounted by pressing into the clay that had been compacted in the test box and then given a tensile load which refers to ASTM D3689-07 procedure E (Constant Rate of Uplift Test). Mobilization of pile friction resistance at critical displacement determined the frictional resistance of the ultimate pile units. The test results showed that the greater the diameter of the pile, the frictional resistance of the ultimate pile units would increase. The increase in frictional resistance of the ultimate pile units showed an average value of around 17.1%.Keywords : Pile foundation, Pile diameter, Friction resistance.AbstrakMeningkatnya pembangunan hunian mengakibatkan naiknya permintaan akan batako, hal ini tentunya Beberapa konstruksi bangunan memberikan batasan kepada perpindahan tiang yang terjadi dengan nilai yang relatif kecil supaya tidak menyebabkan kerusakan struktur. Metode uji yang dipakai adalah membuat box uji model sebagai media pengujian, dengan mensimulasikan model yang sebenarnya ke dalam bentuk model skala. Penelitian dilakukan menggunakan model pondasi tiang tunggal penampang lingkaran lingkaran skala tereduksi yang terbuat dari beton dengan diameter 0,02 m, 0,03 m, 0,04 m dan panjang  masing-masing tiang adalah 0,4 m. Model tiang dipasang dengan cara ditekan pada tanah lempung yang sudah dipadatkan dalam box uji kemudian diberikan beban tarik yang mengacu pada ASTM D3689-07 prosedur E (Constant Rate of Uplift Test). Mobilisasi tahanan gesek tiang pada perpindahan tiang kritis menetukan tahanan gesek satuan ultimit. Hasil uji memperlihatkan bahwa semakin besar diameter tiang, tahanan gesek satuan ultimit tiang akan bertambah. Peningkatan tahanan gesek satuan ultimit tiang menunjukkan rata-rata sekitar 17,1 %.Kata kunci : Pondasi Tiang, Diameter Tiang, Tahanan Gesek Tiang.

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