US 12,343,818 B2
Method and apparatus for analyzing additively manufactured object, and method and apparatus for additively manufacturing an object
Masakazu Shibahara, Osaka (JP); Kazuki Ikushima, Osaka (JP); Atsushi Kawahara, Osaka (JP); Rino Takeuchi, Osaka (JP); and Hikaru Hashizume, Osaka (JP)
Assigned to University Public Corporation Osaka, Osaka (JP)
Appl. No. 16/643,258
Filed by University Public Corporation Osaka, Osaka (JP)
PCT Filed Sep. 7, 2018, PCT No. PCT/JP2018/033185
§ 371(c)(1), (2) Date Feb. 28, 2020,
PCT Pub. No. WO2019/049981, PCT Pub. Date Mar. 14, 2019.
Claims priority of application No. 2017-173123 (JP), filed on Sep. 8, 2017.
Prior Publication US 2020/0331102 A1, Oct. 22, 2020
Int. Cl. B23K 31/00 (2006.01); B23K 15/00 (2006.01); B23K 26/342 (2014.01); B33Y 10/00 (2015.01); B33Y 30/00 (2015.01); B33Y 50/02 (2015.01); G06F 30/23 (2020.01); G06F 113/10 (2020.01); G06F 119/14 (2020.01)
CPC B23K 31/003 (2013.01) [B23K 15/0086 (2013.01); B23K 26/342 (2015.10); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B33Y 50/02 (2014.12); G06F 30/23 (2020.01); G06F 2113/10 (2020.01); G06F 2119/14 (2020.01)] 5 Claims
OG exemplary drawing
 
1. A method for additively manufacturing an object by depositing a molten material while solidifying the material, comprising:
inputting data for performing a thermal-elastic-plastic analysis of the additively manufactured object by employing a finite element method (FEM); and
computing residual stress and deformation caused in the additively manufactured object, by performing the thermal-elastic-plastic analysis in accordance with a set temperature increment and a heat source model indicating a model of heating the additively manufactured object, using time series data of a temperature distribution caused in the additively manufactured object as the object is additively manufactured, wherein
in the computing residual stress and deformation, when a temperature increment following the time series data is given, dynamic explicit FEM is employed to compute the additively manufactured object's displacement and stress until a prescribed static equilibrium condition is reached, and once the displacement has reached the static equilibrium condition, the set temperature increment is given again and the displacement and stress are computed again,
the set temperature increment is set in magnitude to have a value larger in magnitude than a temperature increment used in the thermal-elastic-plastic analysis of the additively manufactured object using static implicit FEM, and
the heat source model is an instantaneous heat source model having a heat input quantity adjusted with respect to a heat input quantity applied when a moving heat source is used to heat the additively manufactured object, so that the additively manufactured objects shrinks in an amount equivalent to that when the moving heat source is used to heat the additively manufactured object, the method further comprising:
determining a heating pattern to be applied in heating a topmost layer of the additively manufactured object, based on a result of the computing residual stress and deformation; and
heating the additively manufactured object using the moving heat source in accordance with the heating pattern.