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- W2006157215 abstract "This paper presents a CMOS stress sensor chip including arrays of piezoresistive sensor elements with high spatial resolution sensitive to the in-plane stress components σxx – σyy and σxy, to the out-of-plane stress σxz and σyz, and to the normal stress sum σΣ = (σxx + σyy)/2 − σzz. For the first time, an application of novel vertical stress sensors is presented, measuring the mechanical stress distributions below electroless nickel (eNi) bumps subject to lateral shear forces and vertical compression. All measured stress values are linearly proportional to the applied forces. The vertical shear stress sensors resolve residual vertical shear stresses of up to 51 MPa in the shear experiments. An adjustable numerical model is established assuming two different Young’s moduli of silicon nitride (SiN) emulating the adhesion between the SiN and eNi. Qualitative agreement of the in-plane stress distributions between experiment and numerical simulation is found in the shear and compression experiments, while good correlation for σΣ is found only for temperature uncompensated stress values in the compression test. The modeling of the absolute values shows differences to the experimental data of about ±30%." @default.
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- W2006157215 date "2011-01-01" @default.
- W2006157215 modified "2023-09-27" @default.
- W2006157215 title "Stress Mapping Below Flip-Chip Bumps With High Spatial Resolution Using Piezoresistive CMOS Sensors" @default.
- W2006157215 doi "https://doi.org/10.1115/ipack2011-52124" @default.
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