Erratum to: Experimental Mechanics

DOI 10.1007/s11340-010-9347-1

In the above mentioned article, due to a systematic error measuring angular position, the penetration force during rotational intrusion, F p(θ), was misreported in Fig. 4b. Correcting the error shifts the angle of peak force (β0) from −0.5 to −0.75 and increases the maximum value of the force increases by 4% (see figure). Model calculations dependent on F p(θ) change slightly with the correction (using β0 = −0.75 and k’ = 65 N/m) and remain qualitatively unchanged as do the conclusions of the paper.

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