scholarly journals FEM analysis of the temperature distribution of CFRTP pipe mold with direct resistance heating

2014 ◽  
Author(s):  
K. Tanaka ◽  
Y. Matsuura ◽  
R. Harada ◽  
T. Katayama ◽  
S. Enoki
Keyword(s):  
Temperature Distribution ◽  
Fem Analysis ◽  
Resistance Heating

scholarly journals FEM Analysis of Temperature Distribution of Flat Mold by Direct Resistance Heating Method

2018 ◽  
Vol 67 (3) ◽  
pp. 367-374
Author(s):  
Kazuto TANAKA ◽  
Jun NAKATSUKA ◽  
Tsutao KATAYAMA ◽  
Hideyuki KUWAHARA
Keyword(s):  
Temperature Distribution ◽  
Fem Analysis ◽  
Resistance Heating ◽  
Heating Method

Embedded resistive heating in composite scarf repairs

2016 ◽  
Vol 51 (18) ◽  
pp. 2575-2583 ◽  
Author(s):  
Mahdi Ashrafi ◽  
Brandon P Smith ◽  
Santosh Devasia ◽  
Mark E Tuttle
Keyword(s):  
Temperature Distribution ◽  
Outer Surface ◽  
Thermal Gradient ◽  
Thermal Damage ◽  
Electrical Current ◽  
Tensile Tests ◽  
Resistance Heating ◽  
Uniform Temperature ◽  
Uniform Temperature Distribution ◽  
Bond Strengths

Composite scarf repairs were cured using heat generated by passing an electrical current through a woven graphite-epoxy prepreg embedded in the bondline. Resistance heating using the embedded prepreg resulted in a more uniform temperature distribution in the bondline while preventing any potential thermal damage to the surface of the scarf repairs. In contrast, conventional surface heating methods such as heat blankets or heat lamps lead to large through thickness thermal gradient that causes non-uniform temperature in the bondline and overheating the outer surface adjacent to the heater. Composite scarf repair specimens were created using the proposed embedded heating approach and through the use of a heat blanket for circular and rectangular scarf configurations. Tensile tests were performed for rectangular scarf specimens, and it was shown that the bond strengths of all specimens were found to be comparable. The proposed embedded curing technique results in bond strengths that equal or exceed those achieved with external heating and avoids overheating the surface of the scarf repairs.

Local Prevention of Hardening for Punching of Hot-Stamped Parts

2015 ◽  
Vol 639 ◽  
pp. 205-212 ◽  
Author(s):  
Kenichiro Mori ◽  
Tomoyoshi Maeno ◽  
Takuya Suganami
Keyword(s):  
Temperature Distribution ◽  
Laser Cutting ◽  
Heating Temperature ◽  
Resistance Heating ◽  
Hardness Distribution ◽  
Delayed Fracture ◽  
Austenitic Transformation ◽  
Sheared Edge ◽  
Heat Transfers

Punching portions of the sheet are sandwiched between the ceramic billets during rapid resistance heating to prevent hardening of these portions. When the heating temperature is locally lower than that of the austenitic transformation, i.e. below 800 oC, this portion is not hardened without occurrence of martensitic transformation, and thus cold punching of hot-stamped parts becomes easy. The ceramic billets are made of alumina and the heat transfers to the billets. The temperature distribution just after resistance heating, the hardness distribution of the hot-stamped sheet, the cold punching load, the quality of the punched hole, etc. were measured. Hardening of punching portions was successfully prevented by sandwiching between the ceramic billets. The cold punching load for the local prevention of hardening was half of that without local prevention and the delayed fracture was also prevented, whereas the drop in hardness around the sheared edge became larger than that for laser cutting.

FEM Analysis of the Pendulum Characteristic of Nature Convection in Dimensional Enclosure

2012 ◽  
Vol 505 ◽  
pp. 195-198
Author(s):  
Quan Gang Yu ◽  
Lin Hua Piao ◽  
Xing Wang
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Tilt Angle ◽  
Model Building ◽  
Fem Analysis ◽  
Two Dimensional ◽  
Point Heat Source ◽  
Equation Solving ◽  
Tilt Sensor ◽  
Characteristic 2

In this paper, the pendulum characteristic of nature convection gas in dimensional enclosure is analyzed by FEM. Using ANSYS-FLOTRAN CFD program, the stream field and the temperature field caused by the point heat source, when the two-dimensional enclosure is inclined, has been obtained by a series of procedure, such as model building, meshing, loads applying and equation solving. The results are as follow: (1)Under the buoyancy lift affecting, the direction of nature convection gas always keeps the vertical upward in two-dimensional enclosure, nature convection gas has the pendulum characteristic. (2)When the dimensional enclosure is inclined, temperature distribution at the several points in dimensional enclosure will change with the tilt angle. The pendulum characteristic can be utilized to measure the tilt angle by the gas pendulum tilt sensor.

Numerical Study on Forming Process by Continuous Resistance Heating

2010 ◽  
Vol 154-155 ◽  
pp. 867-872
Author(s):  
Zheng Xing Men ◽  
Jie Zhou ◽  
Meng Han Wang ◽  
Chang Wei Shao
Keyword(s):  
Temperature Distribution ◽  
Contact Resistance ◽  
Numerical Study ◽  
Mechanical Analysis ◽  
Transient Temperature ◽  
Resistance Heating ◽  
Forming Force ◽  
Forming Process ◽  
Billet Temperature ◽  
Die Geometry

In the present study, an axis-symmetric electro-thermo-mechanical model has been developed to analyze a deformation process by continuous resistance heating. To obtain the transient temperature field prior to forming, a novel temperature-dependent model of the contact resistance was developed in the thermal-electrical analysis. The influences of the contact resistance, the current intensity and the die geometry on the temperature distribution were investigated. In the subsequent electro-thermo-mechanical analysis of the forming process by continuous resistance heating, the variations of the billet temperature distribution, forming force were obtained. The simulation results correspond well with experimental measured values. Furthermore, the influence of a current increasing during forming on the billet temperature and forming force was predicted in order to optimize the forming technology by continuous resistance heating.

scholarly journals FEM Analysis of Temperature Distribution of Mold for CFRTP Pipe Molding Heated by Direct Resistance

2015 ◽  
Vol 64 (11) ◽  
pp. 947-953
Author(s):  
Kazuto TANAKA ◽  
Yasuharu MATSUURA ◽  
Tsutao KATAYAMA ◽  
Hideyuki KUWAHARA
Keyword(s):  
Temperature Distribution ◽  
Fem Analysis
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