Hello there.

I have done a strain gauge analysis of an aluminum bracket under loading. I used a rossette (0/45/90) gauge as the picture_1 shows, the gauge is displaced with 20degree from the x-axis. I calculated the principal strains and stresses under the maximum loading condition and got conflicting inventories. Se the pic_2-pic_4. Can anyone figure out why? Is it a strain gauge error?

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