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This paper is concerned with the lifespan and the blowup mechanism for smoothsolutions to the 2-D nonlinear wave equation$\p_t^2u-\ds\sum_{i=1}^2\p_i(c_i^2(u)\p_iu)$ $=0$, where $c_i(u)\inC^{\infty}(\Bbb R^n)$, $c_i(0)\neq 0$, and $(c_1'(0))^2+(c_2'(0))^2\neq 0$.This equation has an interesting physics background as it arises from thepressure-gradient model in compressible fluid dynamics and also in nonlinearvariational wave equations. Under the initial condition $(u(0,x),\p_tu(0,x))=(\ve u_0(x), \ve u_1(x))$ with $u_0(x), u_1(x)\in C_0^{\infty}(\BbbR^2)$, and $\ve>0$ is small, we will show that the classical solution $u(t,x)$stops to be smooth at some finite time $T_{\ve}$. Moreover, blowup occurs dueto the formation of a singularity of the first-order derivatives$\na_{t,x}u(t,x)$, while $u(t,x)$ itself is continuous up to the blowup time$T_{\ve}$.

On the lifespan of and the blowup mechanism for smooth solutions to a class of 2-D nonlinear wave equations with small initial data