# Energy decay and blow-up of solution for a Kirchhoff equation with dynamic boundary condition

- Hongwei Zhang
^{1}Email author, - Changshun Hou
^{1}and - Qingying Hu
^{1}

**2013**:166

**DOI: **10.1186/1687-2770-2013-166

© Zhang et al.; licensee Springer. 2013

**Received: **16 November 2012

**Accepted: **27 June 2013

**Published: **12 July 2013

## Abstract

The energy decay and blow-up of a solution for a Kirchhoff equation with dynamic boundary condition are considered. With the help of Nakao’s inequality and a stable set, the energy decay of the solution is given. By the convexity inequality lemma and an unstable set, the sufficient condition of blow-up of the solution with negative and small positive initial energy are obtained, respectively.

## 1 Introduction

here $f(s)=|s{|}^{p-2}s$, $M(s)=1+{s}^{m}$, $p>2$, $m\ge 1$ are positive constants and ${\parallel {u}_{x}\parallel}^{2}={\int}_{0}^{l}{u}_{x}^{2}\phantom{\rule{0.2em}{0ex}}dx$.

*x*and time

*t*. Equation (6) was studied by many authors such as Dickey [3], Ball Rivera [4], Tucsnak [5], Kouemou Patchen [6], Aassila [7], Oliveira and Lima [8]; Wu and Tsai [9] considered the following beam equation:

*et al.*[11] showed the existence of a global attractor and an inertial manifold of equation (6) with damping ${u}_{t}$. Ma [12] studied the existence and decay rates for the solution of equation (6) with nonlinear boundary conditions

*et al.*[14] established the existence and exponential decay of the Kirchhoff systems with nonlocal boundary condition. Guedda and Labani [15] gave the sufficient condition of the blow-up of the solution to equation (7) with $g({u}_{t})={u}_{t}$ and dynamic boundary condition. As the related problem, we mention the following:

we refer the reader to [16–19].

When $f=0$ and $M(s)=\beta +ks$, problem (1)-(5) comes from the reference [20–22]. In this case, the model describes the weakly damped vibrations of an extensible beam whose ends are a fixed distance apart if one end is hinged while a load is attached to the other end [21]. One can find many references on problem (1)-(5) with $M=0$ and $f=0$, for example, Littman and Markus [23], Andrews *et al.* [24], Conrad and Morgul [25], Rao [26].

Dalsen [21, 22] showed the exponential stability of problem (1)-(5) with $m=1$ and $f=0$. Park *et al.* [27] discussed the existence of the solution of the Kirchhoff equation with dynamic boundary conditions and boundary differential inclusion. Doronin and Larkin [28] and Gerbi and Said-Houari [29] were concerned with the wave equation with dynamic boundary conditions. Recently, Autuori and Pucci [30] studied the global nonexistence of solutions of the p-Kirchhoff system with dynamic boundary condition.

In this paper, we use the idea of references [31] to get the energy decay and blow-up of the solution for problem (1)-(5). We construct a stable set and an unstable set, which is similar to [32]. By the help of Nakao’s inequality, combining it with the stable set, we get the decay estimate. We find that the set of initial data such that the solution of problem (1)-(5) is decay, is smaller than the potential well in [32]. The blow-up properties of the solution of problem (1)-(5) with small positive initial energy and negative initial energy are obtained by using the convexity lemma [33]. These results are different from the results in [29, 30].

## 2 Assumptions and preliminaries

In this section, we give some preliminaries which are used throughout this work.

We use the standard space ${L}^{p}[0,l]$ and the Sobolev space ${H}_{0}^{1}(0,l)$, ${H}^{2}(0,l)$ with their usual scalar products and norms. Especially, ${\parallel \cdot \parallel}_{p}$ denotes the norm of ${L}^{p}[0,l]$ and $\parallel \cdot \parallel $ the norms ${L}^{2}[0,l]$.

We denote $V=\{u|u\in {H}^{2}(0,l),u(0)={u}_{xx}(0)=0\}$.

**Lemma 2.1**

- (1)
*If*$u\in {H}_{0}^{1}$,*then*$|u(l){|}^{2}\le {\parallel {u}_{x}\parallel}^{2},\phantom{\rule{2em}{0ex}}{\parallel u\parallel}^{2}\le {C}_{0}{\parallel {u}_{x}\parallel}^{2};$(9) - (2)
*If*$u\in V$*and*${u}_{xx}(l)+{u}_{x}(l)=0$,*then*${\parallel u\parallel}^{2}\le {C}_{1}({\parallel {u}_{xx}\parallel}^{2}+{u}_{x}^{2}(l,t))\le {C}_{1}({\parallel {u}_{xx}\parallel}^{2}+{u}_{xx}^{2}(l,t)).$(10)

*Proof*Since $u(0)=0$, we have

and the Cauchy inequality, we can get the result of (10) with the help of (9). □

**Lemma 2.2** [34]

*Let*$\varphi (t)$

*be a non*-

*increasing and nonnegative function on*$[0,\mathrm{\infty})$

*such that*

*then*

*where* *C*, *ω* *are positive constants depending on* $\varphi (0)$ *and other known qualities*.

**Lemma 2.3** [33]

*Suppose that a positive*,

*twice*-

*differentiable function*$H(t)$

*satisfies on*$t\ge 0$

*the inequality*

*where* $\beta >0$, *then there is a* ${t}_{1}<{t}_{2}=\frac{H(0)}{\beta {H}^{\prime}(0)}$ *such that* $H(t)\to \mathrm{\infty}$ *as* $t\to {t}_{1}$.

*u*of problem (1)-(5) means that there exists $T>0$ such that

for all $\phi \in C((0,T),V)\cap {C}^{1}(0,T;{L}^{2}(0,l))$.

*u*of problem (1)-(5) by

## 3 Energy decay of the solution

where ${\lambda}_{1}={(p{B}_{1}^{p})}^{-\frac{1}{p-2}}$, ${E}_{1}=(\frac{1}{2}-\frac{1}{p}){\lambda}_{1}^{2}$. Obviously, ${\mathrm{\Sigma}}_{1}\subset {\mathrm{\Sigma}}_{0}$.

Adapting the idea of Vitillaro [35], we have the following lemma.

**Lemma 3.1** *Suppose that* *u* *is the solution of* (1)-(5), ${u}_{0}\in V$, ${u}_{1}\in {L}^{2}$ *and* $(\parallel {u}_{0xx}\parallel ,E(0))\in {\mathrm{\Sigma}}_{1}$, *then* $(\parallel {u}_{xx}(t)\parallel ,E(t))\in {\mathrm{\Sigma}}_{1}$, *for* $t\ge 0$.

**Lemma 3.2**

*Under the condition of Lemma*3.1

*and*$p>2$,

*then*,

*for*$t\ge 0$,

*Proof*By (14) and (18), we have

where $G(\lambda )=\frac{1}{2}{\lambda}^{2}-{B}_{1}^{p}{\lambda}^{p}$. Note that $G(\lambda )$ has the maximum at ${\lambda}_{1}={(p{B}_{1}^{p})}^{-\frac{1}{p-2}}$ and the maximum value $G({\lambda}_{1})={E}_{1}$. We see that $G(\lambda )$ is increasing in $(0,{\lambda}_{1})$, decreasing in $({\lambda}_{1},\mathrm{\infty})$ and $G(\lambda )\to 0$ as $\lambda \to \mathrm{\infty}$. Since $\parallel {u}_{xx}\parallel <{\lambda}_{1}$, $E(0)<{E}_{1}$, then $\parallel {u}_{xx}\parallel <{\lambda}_{1}$ for any $t\ge 0$, so $G(\parallel {u}_{xx}\parallel )\ge 0$.

so (23) holds. □

**Theorem 3.3**

*Let*$p>2$, $(\parallel {u}_{0xx}\parallel ,E(0))\in {\mathrm{\Sigma}}_{1}$,

*and*

*u*

*be the solution of problem*(1)-(5),

*then there exist two positive constants*

*l*

*and*

*θ*

*independent of*

*t*

*such that*

*Proof*From (16), we have

*u*and integrating over $[0,l]\times [{t}_{1},{t}_{2}]$, by the boundary conditions (2) and (3), we have

then, applying Lemma 2.2, we obtain the energy decay. □

## 4 Blow-up property

In this section, we show that the solution of problem (1)-(5) blows up in finite time if $E(0)<{E}_{0}$.

**Lemma 4.1**

*Suppose*$p>2$, $(\parallel {u}_{0xx}\parallel ,E(0))\in {\mathrm{\Sigma}}^{e}$,

*then*

*Proof*Since $E(t)$ is non-increasing, and $0<E(0)<{E}_{0}$, then $0<E(t)<{E}_{0}$ for $t\ge 0$. Similar to the proof of Lemma 3.2, we have

Otherwise, we suppose that $\parallel {u}_{xx}({t}_{0})\parallel <{\lambda}_{2}$ for some ${t}_{0}>0$ and by the continuity of $\parallel {u}_{xx}\parallel $, we can choose ${t}_{0}$ such that $\parallel {u}_{xx}({t}_{0})\parallel <{\lambda}_{0}$.

This is impossible since $E(t)\le E(0)$ for all $t\ge 0$. Hence, (45) holds. Furthermore, (43) is established since ${\lambda}_{2}>{\lambda}_{0}$. □

**Theorem 4.2** *Suppose that* *u* *is the local solution of problem* (1)-(5), $p>2(m+1)$, $E(0)<0$, *then the solution* *u* *blows up at some finite time*.

*Proof*Let

*β*are positive constants which will be fixed later (see Levine [33]). Then one finds

Noticing $F(0)>0$, by Lemma 2.3, we get the result. □

**Theorem 4.3**

*Suppose that*$u(x,t)$

*is the local solution of problem*(1)-(5), $p>2(m+1)$,

*and that either of the following conditions is satisfied*:

- (i)
$E(0)=0$

*and*$({u}_{0},{u}_{1})+{u}_{0}(l){u}_{1}(l)>0$; - (ii)
$0<E(0)<{E}_{0}$

*and*$\parallel {u}_{0xx}\parallel >{\lambda}_{0}$ (*or*$(\parallel {u}_{0xx}\parallel ,E(0))\in {\mathrm{\Sigma}}^{e}$);

*then the solution* *u* *blows up at some finite time*.

*Proof*(i) For $E(0)=0$, similar to the proof of Theorem 4.2, we take $\beta =0$ in (51), then (53) holds. Since $F(0)>0$, ${F}^{\prime}(0)=2({u}_{0},{u}_{1})+2{u}_{0}(l){u}_{1}(l)>0$, then the result holds by Lemma 2.3.

- (ii)For the case of $0<E(0)<{E}_{0}$, from (48), (49), (50) and (14), we get$\begin{array}{rl}{F}^{\u2033}(t)=& 2[{\parallel {u}_{t}\parallel}^{2}+{u}_{t}^{2}(l,t)-{\parallel {u}_{xx}\parallel}^{2}-{u}_{xx}^{2}(l,t)-{\parallel {u}_{x}\parallel}^{2}-k{\parallel {u}_{x}\parallel}^{2(m+1)}+\beta ]\\ +p[{\parallel {u}_{t}\parallel}^{2}+{u}_{t}^{2}(l,t)+{\parallel {u}_{xx}\parallel}^{2}+{u}_{xx}^{2}(l,t)+{\parallel {u}_{x}\parallel}^{2}+k{\parallel {u}_{x}\parallel}^{2(m+1)}-2E(t)]\\ =& (p+2)[{\parallel {u}_{t}\parallel}^{2}+{u}_{t}^{2}(l,t)]+(p-2)[{\parallel {u}_{xx}\parallel}^{2}+{u}_{xx}^{2}(l,t)+{\parallel {u}_{x}\parallel}^{2}\\ +(\frac{p}{m+1}-2)k{\parallel {u}_{x}\parallel}^{2(m+1)}]+2\beta -2pE(t).\end{array}$(55)

The remainder of the proof is the same as the proof of Theorem 4.2. □

## Declarations

### Acknowledgements

We thank the referees for their valuable suggestions which helped us improve the paper so much. This work was supported by the National Natural Science Foundation of China (11171311) and the Key Science Foundation of Henan University of Technology (09XZD009).

## Authors’ Affiliations

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