阵列探针在离心铸造六方柱不锈钢中传播波的有限元模拟

Shan Lin, Y. Ikegami
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引用次数: 0

摘要

离心铸造不锈钢(CCSS)广泛应用于压水堆一次冷却剂系统。然而,由于这种材料的粗颗粒和各向异性,超声波检测非常具有挑战性。相控阵超声技术(PAUT)被认为是解决上述问题最有前途的方法。为了提高柱状颗粒CCSS的PAUT精度,我们采用基于体素的有限元方法模拟了CCSS中波浪的传播,其中波浪由线性阵列激发。我们用六角形柱模拟了CCSS中的柱状颗粒,并引入了一个侧钻孔。通过旋转晶轴,很容易形成不同的倾斜柱状晶粒。所有柱状晶体都被认为是立方晶体,而具有柱状晶粒的CCSS在宏观上是横向各向同性的。计算了不同震源规律下的波传播,并对结果进行了比较。根据CCSS的各向异性计算震源律时,波准确地向目标SDH传播并聚焦,但根据各向同性计算震源律时,波偏离了目标SDH。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
FEM Simulation of Waves Excited by Array Probe Propagating in Centrifugally Cast Stainless Steel With Hexagonal Column
Centrifugally cast stainless steel (CCSS) is widely used in PWR primary coolant systems. However, ultrasonic testing for such material is very challenging because its coarse grains and anisotropic property. The phased array ultrasonic technology (PAUT) is considered the most promising solution to the problem mentioned. To improve the accuracy of PAUT for CCSS with columnar grains, we used the voxel-based finite element method to perform simulation of wave propagation in CCSS, where waves were excited by a linear array. We modeled columnar grains in CCSS with hexagonal columns and introduced a side-drilled hole. It was easily to have different inclined columnar grains by rotating the crystal axes. All column crystals were considered cubic crystals while CCSS with columnar grains was macroscopically transversely isotropic. Wave propagations were computed for different focal laws and their results were compared. Waves exactly propagated toward and focused at the targeted SDH when focal laws were calculated according to the anisotropic property of CCSS, but deviated the target for focal laws based on isotropy.
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